Improvements in and relating to Pentagraph Engraving and Tracing Machines.
Year: 1892

page_text: Date of Application, 10th May, 1892
Complete Specification Left, 9th Feb., 1893-Accepted, 29th Apr., 1893
PROVISIONAL SPECIFICATION.
Improvements in and relating to Pentagraph Engraving and
Tracing Machines.
We ADAM EASTON KNOX, Engineer, of 47 Crownpoint Road, and GEORGE
STEWART, Engraver, of 33 McIntosh Street, Dennistoun, both in Glasgow,
Lanarkshire, do hereby declare the nature of our invention to be as follows:-
This invention has reference to and comprises a new or improved construction
or arrangement and combination of the parts of a multiple pentagraph tracing or
engraving machine, suitable for the tracing or engraving of designs on the surfaces
of objects such as gas globes or. "moons," tumblers, glasses, and other such small
objects in glass or metal in great numbers at a time mostly for afterwards etching
the designs in by acids the designs generally being reduced from a single large
pattern laid on the pentagraph table under the tracing arm, and in which the
globes or objects to be engraved are set on trays in sets on a vertically traversing
table frame or platform under the set of tracing points or diamonds, which are
carried on revolving spindles and frames in the axial line of each of the objects to
be engraved, so that one traversing frame of the pentagraph imparts a pro-
portionate reduced rotary motion to the tracing arms for producing the lines in the
circumferential direction on the objects, while the frame of the pentagraph at right
angles to this imparts a proportionate raising and lowering action to the platform
and globes to give the lines in the vertical direction on the objects, and which will
save much time and expedite the work in a more efficient manner than has been
possible in the machines heretofore employed for that purpose.
According to one arrangement the nature and novelty of the invention consists
all as follows:-The pentagraphic part of the machine consists of two open end
frames secured together by stays and with a pattern table on top at a proper height
for the tracer to actuate the tracing arm and levers of the pentagraph over the
large pattern of the design preferably secured to the foundation at soine distance
from and near the centre of the tracing or engraving machine proper which also
consists of two strong open end frames very much taller than the pentagraph frame
and strongly bound together near the top by preferably three or other number of
longitudinal bars, while at the bottom they may be secured by flanged feet to the
same foundation or floor as the pentagraph machine or to a special sole plate.
The pentagraph machine consists of an under parallel transverse frame traversing
on rollers and guide bed on the top of the pentagraph table, this having parallel
guide rails and rollers above it with a frame traversed longitudinally on this
transverse travelling table or frame both actuated proportionately by the penta-
graph levers according as the tracing arm of the pentagraph is moved transversely
or longitudinally over the pattern, so far all substantially as in other pentagraph
machines in use. But by these improvements the lower transverse traversing
frame is connected by a vertical and horizontal knee arm or rail frame carried up
and across the top of the framing of the engraving or tracing machine, having an
antifriction roller under it traversing on a rail secured on the top of the longi-
tudinal beams. This lateral traversing arm has projecting horizontal arms to
which the steel bands would be secured passing in reverse directions round a
quadrant differential speed cone, oscillating between the arms and secured near the
top of one of the vertical spindles carrying the tracing levers, or it might be a
separate spindle; in either case so as to give the rotating motion to all the vertical
spindles carrying the tracing levers, which in this arrangement would be carried
in three longitudinal rows at equal distances apart each spindle being carried in
hardened steel screw adjustable centres in brackets bolted to the upper and lower

page_text: sides of the upper longitudinal beams and passing down through holes in these or
at one side of them all as will be hereinafter described to carry and actuate their
tracing levers. In this arrangement the pentagraphic mechanism would have an
upper longitudinal traversing rail or table working on rollers on a fixed rail below,
carried on an open rectangular frame bolted to the pentagraph frame and carried
high up so as to have a short horizontal spindle mounted in an open part of the
frame above in adjustable steel centres having mounted on it an inverted vertical
longitudinally reciprocating differential segmental lever with steel bands mounted
on it in opposite directions and secured to adjustable screw brackets on the said
longitudinal traversing table. This table which only moves longitudinally gets its
motion by a sliding gab or gap piece on it working on a horizontal transverse parallel
rail which is mounted on the upper of the two transverse and longitudinal traversing
tables of the pentagraph mechanism, which thus gives the longitudinal oscillating
action to the inverted segmental band lever and its upper horizontal spindle. This
spindle has also mounted on it a pulley with double steel bands for actuating a
vertical reciprocating bar, working on guide rollers or other equivalents in the
upper frames, which has attached to its upper end chains, bands or other
equivalents connected to one end of segmental oscillating beam levers preferably
carried on steelyard or equivalent steel centres in the centre each mounted on the
top of a high column or other equivalent erected between the frame of the
pentagraph mechanism and the frame of the tracing or engraving machine. These
beam levers would be set at such an angle that the other segmental ends of the
levers would have corresponding chains or bands mounted on them and led down
and connected to the longitudinal table frame mounted on the lower part of the
engraving machine and carrying the globes or other objects to be engraved all in
a balanced position on these beams, and counterweighted by a weight on the
vertical reciprocating rod at the pentagraph end of the two beams, all so as to give
the beforementioned proportioned vertical balanced motion to the table and globes
under and concentric to the spindles rotating with the tracing levers actuated by
the transverse reciprocating table of the pentagraph as before described. The
said frame of the tables carrying the globes or articles to be engraved would
consist of a longitudinal strong light parallel frame, preferably made of steel
angle iron and flat longitudinal and angled flat staying bars secured to and steadied
on vertical bars at its ends, with brackets carrying antifriction rollers at the
lower and upper parts of these bars preferably on steel centre adjusting screws, 80
as to reciprocate vertically in planed grooved guide plates screwed or formed on
the inside of the end frames of the machine. The top of this frame would be
fitted with four or other number of portable strong light flat table boards, prefer-
ably one on each side of the two chains carrying it in angle iron or other guides.
These portable tables or boards might be strengthened with light angle bars to
prevent them from warping. To prevent these table boards being acted on by the
hydrofluoric or other acid employed for etching they would be covered or coated
with gutta percha or other equivalent material over and on which the globes or
other articles to be engraved would be set, and might be secured by the wax or
other equivalent resinous material into which they are dipped for coating them and
tracing the designs through, the wax securing them in proper positions on the
boards under the tracing spindles and their levers. Thus if there were three
longitudinal rows of twelve spindles in the machine, each of these portable tables
would support and carry nine globes or articles to have the designs traced on them,
and which might then be each removed and dipped into a large bath of the acid to
etch them at one operation, and remove them when etched to replace the new
globes or objects on them to be traced as before stated. These portable table
boards may however in some cases be made of rigid material such as vulcanite or
other equivalent which would resist the action of the acid used and strengthened
by metal rods interually vulcanized in them to give them stiffness and rigidity for
their constant removal and portable use. For giving rotation to each longitudinal
row of vertical spindles a light longitudinal rod would be mounted along one side

page_text: of each set of the cross arms of the rings or discs carrying the tracing arms, that
is three longitudinal rods bound all together by three or more cross rods, having
brackets projecting out from them with adjustable conical steel pointed screws,
which would work in corresponding centre holes in plates secured in the upper
cross arms of each spindle, so that this frame would be reciprocated longitudinally
and laterally in a parallel manner from the said first spindle before described
actuated from the transverse oscillated quadrant cone to turn each crosshead and
spindle of the whole set of spindles, equally and differentially to that of the first
motion spindle. The lower disc or ring of each of these spindles so moved would
be formed with a turned bevel edge on the inner and outer surfaces, on to which
four, eight, or other number of corresponding internally.bevelled joint centre
hangers or brackets would be secured by thumb screws or other equivalent in the
upward projecting flange of the hangers taking on to the outer bevelled edge of the
ring. These hangers would have steel pointed screws in them to secure the upper
fulcrum cuds of hanging bell crank levers, with inward radially projecting arms on
which the drop plates, rings or discs would act to radially press out, against the
action of a spring, the lower vertical arms which would carry the tracing points,
and which when made as pointed short steel rods might pass through radial or
lateral holes through short screw studs, with nuts on them, secured to the lower
end of each lever, and which would tighten up and secure the pointed tracers
against the side of the lever to radially act on the globe or object to be engraved.
In most engraving machines, each tracing lever has a weight or a rubber or other
spring to press the tracing points against the globes or objects to be operated on,
and these may still be used, but by these improvements one band spring might be
passed round the whole of the levers to act on them all at once, with the same
pressure, or have one band acting on each opposite four, so that any opposite four
levers may be taken out of action without interfering with the strength of the
springs of the others. The drop arrangements of mechanism for placing these
levers into or taking them out of action, consists in having a long horizontal light
steel rod or bar ranged along each side of each row of the vertical spindles carried
by vertical bars projecting up from them, and jointed to the free ends of horizontal
levers of two horizontal cross shafts carried on bearing brackets over the three
longitudinal top frames, one on each side of the chains or wire ropes from the top
oscillating beams which reciprocate the tables carrying the globes to be engraved.
Thus, the horizontal cross spindles, say those on the right hand side of the chains,
have their levers projecting to the left, and coupled to the bars on the one side of
the spindles, which would be so connected to a central disc as to reciprocate this
up and down on each spindle, with a hole large enough in it to clear the spindle.
This disc plate would act as a "drop" for depressing the horizontal bellcrank arms
of say four of the tracing levers. While the opposite or left hand transverse
shafts would have their levers projecting horizontally towards the others, but be
connected to the longitudinal bars on the opposite sides of their rows of spindles,
these bars being in this case connected to a "drop" ring reciprocating outside of
the before mentioned central discs, and made to act on the horizontal levers of the
other four vertical tracing levers. Thus either or both of these "drop" discs or
rings might be used separately or jointly to take any four of the vertical tracing
levers out of action or the whole eight according as the two sets of transverse shafts
were oscillated with their levers for that purpose. Thus the right hand cross
shafts would have a borizontal lever mounted on their outer free ends projecting
in the same direction, and by a cord or other equivalent be carried down to be
actuated by one arrangement of treadle lever; while the other or left hand two
spindles would have horizontal levers projecting in the other direction with wire or
other cords carried down to actuate another arrangement of treadle lever; and
which treadle levers would be so placed in front of and under the pentagraph table
as to be actuated either separately or jointly by the person operating the pentagraph
to work either or both "drop" arrangements to take one set of four or the whole
eight tracing levers out of action on all the spindles at the same time. And

page_text: counterbalancing levers and weights would be fitted on the levers of these shafts.
and treadles so as to make them to be simply and easily actuated as described.
And in some cases when found desirable the weight of these spindles carrying the
tracing levers may also be each counterbalanced to take the friction off their steel
centre points by fitting each spindle with a light rigid bow at top, and connecting
it by a cord or light wire in the vertical line of the spindle to an adjustable
weighted lever fulcrumed over each spindle on the bracket carrying the top centre
points; or otherwise the cord or wire from the bow of each spindle might be carried
up to a light stationary frame above and adjusted to it by a spring and screw for
each to take the weight off each spindle; or this frame might be made adjustable
to take the weight of the whole of the spindles at once. Instead of the portable
tables carrying the whole divisional sets of globes, a small plate or chuck might be
used for each globe secured separately on the vertical reciprocating table. Our
improvements may also be applied to pentagraph machines where the globes
received a circular motion and the tracing points reciprocated vertically.
Dated the 9th May 1809
W. R. M. THOMSON & Co.,
96, Buchanan Street, Glasgow, Agents.
COMPLETE SPECIFICATION.
Improvements in and relating to Pentagraph Engraving and
Tracing Machines.
We, ADAM EASTON KNOX, Engineer, of 47 Crownpoint Road, and GEORGE
STEWART, Engraver, of 33 McIntosh Street, Dennistoun, both in Glasgow,
Lanarkshire, do hereby declare the nature of our invention, and in what manner
the same is to be performed to be particularly described and ascertained in and by
the following statement in writing, that is to say :—
This invention has reference to and comprises a new or improved construction, or
arrangement and combination of the parts of a multiple pentagraph tracing or
engraving machine, suitable for the tracing or engraving of designs on the surfaces
of objects such as gas globes or moons, tumblers, glasses, and other such small
objects in glass or metal in great numbers at a time mostly for afterwards etching
the designs in by acids, the designs generally being reduced from a single large
pattern tracing plate laid on the pentagraph table under the tracing arm; and in
which machine the globes or objects to be engraved are set on trays or boards in
sets on a vertically traversing table frame or platform under the set of tracing
steel points or diamonds. These points are carried on revolving spindles and
frames in the axial line of each of the objects to be engraved, so that one traversing
frame of the pentagraph imparts a proportionate reduced rotary motion to the
tracing arms for producing the lines in the circumferential direction on the objects,
while the frame of the pentagraph, at right angles to this imparts a proportionate
raising and lowering action to the platform and globes to give the lines in the
vertical direction on the objects, and which will save much time and expedite the
work in a more efficient manner than has been possible in the pentagraph engraving
machines heretofore employed for that purpose.
.
And in order that our said invention and the manner of performing or carrying
the same into effect or practice may be properly understood, we have hereunto
appended three sheets of explanatory drawings, in which the same reference letters
are used to indicate corresponding parts in all the figures where shown.
Figure 1 on Sheet 1 is a vertical front elevation of one construction and
arrangement of this improved pentagraph tracing and engraving machine, but with
parts of the ends of the ends of the frames B, B, broken away at z, and the upper
parts of the columns F' carrying the oscillating beam levers F, F, broken away
at z¹.
Figure 2 on Sheet 2 is a plan view corresponding to Figure 1, with parts at the

page_text: ends of the frames D, D, also broken away at 2, Dut blowing the columns
oscillating beam levers F F.
Figure 3 is a transverse vertical section of the same machine taken near the
centre and lines 1-1 and 2-2 in Figures 1 and 2.
Figures 4 and 5 on Sheet 2 are a sectional elevation and plan detached, to a
larger scale, of one of the oscillating or rotating spindles C carrying one double set
of the tracing levers and points c, e, c', e¹, to show the details of these parts more
clearly than can be seen in the general views Figures 1 to 3.
Referring to these drawings -The pentagraphic parts of this machine consists
of two open end frames A, A, secured together by stays; and a pattern table A¹
on the top at a proper height for the tracer to actuate the tracing arm lever of
the pentagraph over the large pattern plate y of the design preferably secured to
the floor or foundation Z by flange feet at A³, at some distance from and near the
centre of the frames B', B, of the tracing or engraving machine proper, which also
consists of two strong open end frames B, B, very much taller than the pentagraph
frames A, A, and strongly bound together near the top by preferably three or other
number of longitudinal bar frames B', while at the bottom they may be secured by
Hanged feet B to the same foundation or floor Z as the pentagraph machine, or to a
special sole plate. The pentagraph machine consists of an under parallel transverse
rail frame a traversing on rollers a' and guide bed rails A³ on the top of the
pentagraph table A, this frame a having longitudinal parallel guide rails a* and
rollers as above it, with another frame a traversed longitudinally on this transverse.
travelling table or frame a, a², both actuated proportionately by the pentagraph
lever according as the ordinary tracing arm of the pentagraph is moved trans-
versely or longitudinally over the pattern plate y, by being secured to the upper
frame A by a knee bracket a¹, so far, all substantially as in other pentagraph
machines in use. But by these improvements the lower transverse traversing
frame is connected by a vertical and horizontal knee arm or rail frame b, b¹,
secured to the frame A at b¹ and carried up and across the top of the framing.
at 6, of the engraving or tracing machine B, B¹, having an antifriction.
roller under it traversing on a rail frame * secured on the top of the
longitudinal beams B, B This lateral traversing arm 6 has projecting
horizontal arms 15, seen particularly in Figures 1 and 2, to which steel
bands, would be secured passing in reverse directions round a quadrant.
differential speed cone oscillating between the arms 6, 6, and secured on aud.
near the top of one of the vertical spindles C, carrying the tracing levers c, c¹,.
or it might be a separate spindle as C₁ connected. to and actuating this spindle C
below it in either case so as to give the rotating motion to all the vertical
spindles C. carrying the tracing levers c, c', which in this arrangement would be
carried in three longitudinal rows at equal distances apart, as seen particularly
in Figures 2 and 3; each spindle C being carried in hardened steel screw
adjustable centres C in brackets C2, C3, bolted to the upper and lower sides of
the upper longitudinal beams B', B1, B2, and passing, down through holes in these
(or it might be at one side of them) in the axial line of the globes or objects X
to be engraved, all as will be hereinafter described, to carry and actuate their
tracing levers c, c. In this arrangement the ordinary pentagraphic mechanism
would have an additional new upper longitudinal traversing rail or table d working.
on rollers d' on a fixed rail di below, carried on an open rectangular frame D,
bolted at D to the pentagraph frame A, A, and carried high up with a horizontal
open frame D* at top, so as to have a short horizontal spindle D' mounted in the
open part D of the frame D, D', above, in adjustable steel centres on each side
and having mounted on it an inverted vertical longitudinally reciprocating.
differential segmental counterbalanced lever D' with steel bands D' mounted on
it in opposite directions and secured to adjustable screw brackets at the ends of
the said longitudinal traversing table d. This table d which only moves longi-.
tudinally on the rollers d' gets its motion by a sliding gab or gap piece d bolted to
it near the centre, and works on a horizontal transverse parallel rail a', which is

page_text: mounted on the upper rail table a' of the two respectively transverse and longitudinal.
traversing tables a', a², and a*, of the pentagraph mechanism, which thus gives the
longitudinal oscillating action to the inverted segmental band lever D, and its upper
horizontal spindle D³. This spindle D³ has also mounted on it a pulley E, with
double steel bands E' E' stretched in opposite directions for actuating a vertical
reciprocating bar E², connected at its upper and lower ends by adjustable screws e³
to these straps or bands E'. This bar E² has attached to its upper end two
chains E³, (or it might be bands or other equivalents) each connected at E* to the
near end F of two segmental oscillating beam levers F, F¹, preferably carried on
steelyard or equivalent steel fulcra F³, near the centre, each mounted on the top
of a high column F³, or other equivalent, erected between the frame A, A, of the
pentagraph mechanism and the frame B, B, of the tracing or engraving machine.
These beam levers F, F', would be set at such an angle that their other outer
segmental ends F, would have attached to them chains F³, secured at F4 (or other
equivalent bands corresponding to E3 at the other end) and each connected to
cross bars F, and rods and led down and connected at F8 to the longitudinal
table frame G, mounted to reciprocate on guides Gʻ, bolted to the frames B, B, of
the engraving machine, and which carry the globes X or other objects to be
engraved, all in a balanced manner and position on these beams F, F' and counter-
weighted by weights W, mounted on a lower cross bar W₁ connected by two
links W' to the upper cross bar W³ jointed and hung at the centre to the lower end
of the vertical reciprocating rod E' at the pentagraph end of the two beams F F¹,
all so as to give the beforementioned proportioned vertical balanced motion to the
table frame G, and globes X, which would be each secured under and concentric
to the spindles C, rotating with the tracing levers c, c', and respectively actuate
the frame G, and globes X, up and down by the longitudinal reciprocating
pentagraph table a, a, and d and the spindle C and tracing lever c, c, by the
transverse reciprocating table a, a², and b, b, of the pentagraph both through their
respective segmental band levers D', and ', all' as before described. The said
frame G, of the table g, for carrying the globes X, or other articles to be
engraved, would consist of a strong light parallel longitudinal lattice frame,
preferably made of steel angle iron, with longitudinal and transverse members g³, g³,
above and below, bound rigidly together by corresponding vertical and angled
tie and stay bars 9 all secured to and steadied by vertical bars G2 at its
ends G, with brackets carrying antifriction rollers G³, at the lower and upper
parts of these bars G2, preferably carried on steel centre adjusting screws, so as to
reciprocate vertically in planed grooved guide plates G screwed, or formed, on the
centre and inside of the end frames B, B, of the machine. The tops of this
frame G, G, would be fitted with four or other number of portable strong light
flat table boards g, preferably mounted on or between transverse angle iron guide
bars g', g¹, one board g on each side of the two chains or rods F carrying the
whole frame G, G.
These portable tables or boards g, might be strengthened with light transverse
angle bars to prevent them from warping. To prevent these table boards 9 being
acted on by the hydrofluoric or other acid employed for etching the glass globes or
other objects carried on them, they would be covered or coated with gutta percha
or other equivalent material used to resist such acids over and on which the
globes X, or other articles to be engraved would be set, and might also be secured
by the wax or other equivalent resinous material into which they are dipped for
coating them and tracing the designs through, the wax or resin thus securing them
in proper positions on the boards y axially in line under the tracing spindles C, and
their tracing levers c c¹. Thus if there were three longitudinal rows, of twelve
spindles C in the machine, each of these portable tables g, would support and
carry nine globes, or articles X to have the designs traced on them, and which
board g with the globes on it, might then be each removed and dipped into a large
bath of the acid to etch them all at one operation, and remove them when etched
to replace the new globes, or objects on them to be traced as before stated. These

page_text: portable table boards g, may however in some cases be made of rigid material such
as vulcanite or other equivalent, which would resist the action of the acid used, and
be strengthened by metal rods internally vulcanized in them to give them stiffness
and rigidity for their said constant removal and portable use. For giving the
turning rotatory motion to each longitudinal row of vertical spindles C, C, C, a
light longitudinal rod I, would be mounted along one side of each set of their
cross arms C of the rings or discs C carrying the tracing arms c, c' that is three
longitudinal rods I bound all together by three or more cross rods I' and having
brackets I projecting out from them with adjustable conical steel pointed screws I³
in them, or it might he spindles with a supporting bracket i, and which would work
in corresponding centre holes in steel plates secured in the said upper cross arms C
of each spindle C, so that this frame or rods I, I, I would be reciprocated longi-
tudinally and laterally in a parallel manner from the said first spindle C¹
actuated from the transverse oscillated quadrant cone 6' to turn each crosshead C³
and spindle C of the whole set of spindles C equally and differentially to that of
the first motion spindle C' actuated as described from the pentagraph mechanism.
The lower disc or ring C³ of each of these spindles C, C, so moved would be
formed with a turned bevel edge on the inner and outer surfaces on to which four,
eight, or other number of corresponding internally bevelled joint centre hangers or
brackets c² would be secured by thumb screws or other equivalent on the bevelled
edges of the ring C. These hangers would have steel pointed screws in them
to secure the upper fulcrum ends of the hanging bell crank levers c, c', with inward
radially projecting arms c³, c, on which the drop plate rings c and discs c would
respectively act to radially press out against the action of a spring shown as an
elastic rubber band c' on the tracing levers c, c', pressing them in for the tracing
points e at their lower end to act on the globes X and which when made as pointed
short steel rods as shown might pass through radial or lateral holes through short
screw studs el with nuts e² on their other opposite sides secured to the lower end
of each lever c, c', and which would tighten up and secure the pointed tracers e
against the side eye of the lever to radially act on the globe or object to be
engraved.
In most engraving machines, each tracing lever c or c¹ has a weight, or a rubber,
or other spring to press the tracing points against the globes or objects to be
operated on, and these may still be used, but by these improvements one band
spring c might be passed round the whole of the levers c, c', as shown in Figure 4,
to act on them all at once, with the same pressure, or have one band acting on each
opposite and intermediate set, of four, that is c or c¹ so that any opposite four levers
may be taken out of action without interfering with the strength of the springs of
the others. The drop arrangements of mechanism for placing these levers c, c', into
or taking them out of action, consists in having a long horizontal light steel rod or
bar J, Jranged along each side of each row of the vertical spindles C carried
by vertical duplex or double bars J, Js, projecting up from them, and jointed
respectively to the free adjacent ends of horizontal levers H, H³, on two horizontal
cross shafts H, H', carried on bearing brackets H bolted at opposite ends over the
three longitudinal top frames B', one shaft being mounted on each side of the
chains F, and hanging rods F', hung from the top oscillating beam levers F, F,
which reciprocate the tables g, carrying the globes X to be engraved. Thus, the
horizontal cross shafts H', H', say those on the outer side of the chains and
rods F, F, looking from the front in Figures 1 and 2 have their levers H³, H³,
projecting inwards, and coupled to the bars J' on the one side of the spindles C
which would be so connected by brackets J³ to the central disc c, as to reciprocate
this up and down below the centre of each spindle C. This disc plate c, would act
as a drop for depressing the long horizontal bellcrank arms, of say four of the
tracing levers c¹. While the opposite or inner transverse shafts H, H, would have
their levers H, H2, projecting horizontally towards the others, but be connected to
the longitudinal bars J on the opposite sides of their rows of spindles C, these
bars J being in this case connected by brackets J' to a "drop" ring reciprocating

page_text: outside of the before mentioned central discs c of each spindle C, and made to act
on the shorter horizontal levers c of the other four vertical tracing levers c. Thus
either or both of these "drop" discs or rings e, c, might be used separately or
jointly to take any four of the vertical tracing levers c or c¹ out of action, or the
whole eight, according as the two sets of transverse shafts H, H', were oscillated
with their levers for that purpose. Thus the outer cross shafts H', H', would each
have a horizontal lever mounted on their outer free end projecting in the same
direction as the levers H, and by a light rod or other equivalent be carried
16;
down to be actuated by a pin h in the back end of a treadle lever frame hº,
while the other or inner two shafts H, H, would each have a horizontal longer
lever projecting in the other direction, that is, in the same direction as the
levers H with a rod 2 carried down to be actuated by the same pin ' as the other
rods ³, . This treadle lever frame 1, h, is so mounted on a fulcrum bar 17, in
front of and under the pentagraph table A', between the frames A, as to be
actuated by the front treadle bar 48 depressed by the foot of the person operating
the pentagraph tracing lever to work either or both drop arrangements of
plate or according as either of the rods 2 or 3 were disconnected from the
treadle lever ', to take one set of four c or the other c' or the whole eight tracing
levers out of action on all the spindles C at the same time, when both sets
of rods are connected to the treadle lever. As shown in the drawings,
the weights of the levers H2, H3, and their actuating bars J, J', depress the
droppers c³, c, to take the tracing levers e, c', out of action, and also depress the
back end of the treadle lever frame h°, h, so that the front end of the treadle
lever 1, h³, has to be depressed and held down by the foot against this counter-
balance weight to permit the tracing levers c, c', to trace or engrave the design
required on the globe X, so that the tracing points e are automatically taken out
of action when the foot is released. Instead of the portable tables g hereinbefore
described carrying the whole divisional sets of globes X, a small plate or chuck
might be used for each globe secured separately on the vertical reciprocating
table G, g.
Although we have described this machine as constructed in accordance with the
drawings, in all its details, it will be obvious that many of the minor parts might be
modified without interfering with the main features and novelty of the invention,
such as mounting the globes to be engraved in smaller numbers and on lesser
sized portable boards g as three in the row on one narrow cross portable tray g.
And although we have only shown and described three rows of spindles and globes
as arranged in line in the longitudinal direction it is to be understood that a fewer
or greater number of rows may be arranged and a fewer or greater number of
globes be placed in each row, and that the number of tracing levers round each
spindle may be varied. And that although the frame G, g carrying the globes
to be engraved is shown and described as carried and oscillated by fulcrumed beam
levers F, F, it might be oscillated in an equivalent manner by chains or wire ropes
passed over pulleys carried on steel spindles and antifriction pulley bearings or
steel centres. And that although the transverse traversing frame a, a, of the
.pentagraph is made to oscillate or rotate the vertical spindles C, it will be obvious
that the longitudinal reciprocating frame a might be made to do this by mounting
the primary first notion band segmental lever at right angles to its present
position on the spindle C, and also make the transverse traversing frame a, a, to
actuate the vertical oscillating balance lever for giving the up and down motion to the
frame G carrying the globes by merely mounting the spindle 3 of the balance
lever D at right angles to its present position instead of doing so by the
longitudinal traversing frame a, a, i, as described in reference to the drawings.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is :-
:-
First. The construction or general arrangement and combination of the parts

page_text: fa pentagraph tracing or engraving machine, substantially as herein described in
eference to and shown in the accompanying drawings.
Second. In a pentagraph tracing or engraving machine the arranging of the
pindles of the tracers in rows on a fixed frame so as to be oscillated or rotated by
one parallel acting frame of the pentagraph to produce the circumferential lines
round the globes or objects to be engraved, these objects being mounted in corre-
ponding sets under the spindles on a vertical reciprocating frame actuated by the
reverse parallel acting frame of the pentagraph to produce the lines in the vertical
direction parallel to the axis, substantially as and in the manner herein described
n reference to and shown in the accompanying drawings.
Third. In a pentagraph tracing or engraving machine, the oscillating of all the
tracer spindles in rows by a longitudinal rod for each row, connected as a recipro-
cating frame, and with steel centres or spindles to each, all actuated from the
segmental steel band spindle from the pentagraph, substantially as herein described,
in reference to and shown in the accompanying drawings.
Fourth. In a pentagraph tracing or engraving machine, the hanging of the
tracing levers in double sets as bellcranks to a ring secured to and below each
tracing spindle, with a depressing annular and central disc dropper mounted over
said levers and reciprocated vertically by a single horizontal bar and vertical bar
and set of levers on overhead cross shafts for each row of droppers, from a
treadle movement, to take either or both sets of tracing levers out of or put them
into action, all substantially as herein described, in reference to and shown in the
accompanying drawings.
Fifth. In a pentagraph tracing or engraving machine, the mounting of sets of
globes or objects in rows under the tracing spindles on a vertically reciprocated
frame actuated up and down by the opposite reciprocating frame of the pentagraph
from that which reciprocates the spindles, through a weight balanced vertical
segmental band lever and reciprocating rods and chains, substantially as herein
described in reference to and shown in the accompanying drawings.
Sixth. In a pentagraph tracing or engraving machine, the mounting of an
additional traversing frame on a fixed rail over the ordinary traversing frames of
the pentagraph machine, for actuating a vertical balanced segmental reverse band
lever on a horizontal spindle, with reverse band wheel for operating the rod and
chain balanced reciprocating mechanism of the frame carrying the globes or
objects to be engraved, substantially as herein described in reference to and shown
in the accompanying drawings.
Seventh. In a pentagraph tracing or engraving machine, the construction of a
long horizontal light lattice or equivalent rigid reciprocating frame for carrying
the globes or objects to be engraved in sets under their spindles, substantially as
herein described in reference to and shown in the accompanying drawings.
Eighth. In a pentagraph tracing or engraving machine, the mounting of the
globes or objects to be engraved in sets or rows on portable removable table boards,
so that they may be removed and dipped in sets in the acid trough, for etching at
one operation, substantially as herein described in reference to and shown in the
accompanying drawings.
Ninth. In a pentagraph tracing or engraving machine, the use of an india rubber
or equivalent band spring for embracing and actuating the sets of tracing levers,
substantially as and in the manner herein described in reference to and shown in the
accompanying drawings.