AN IMPROVED METHOD OF SIGNALIZING OR TELEGRAPHING ON SEA OR LAND, PREVENTING COLLISION AT SEA, AND GIVING SIGNALS OF DISTRESS, BY IMPROVED BURNERS WITH GLASSES COLORED, AND SIGNAL CARDS APPLICABLE TO RAILWAYS IN ALL THE VARIOUS DEPARTMENTS, AS WELL AS PREVENTING OF ACCIDENTS WHEN THE TRAIN IS AT FULL SPEED, SHEWING THE STATE OF THE TIDE IN HARBOURS, ALSO THE DIURNAL FOR RAILWAYS, TOWNS, VILLAGES &c. &c.
Year: 1845

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ROBERT
RETTIE, of Glasgow, in the County of Lanark, Civil Engineer, send greeting.
WHEREAS Her present most Excellent Majesty Queen Victoria, by Her
Royal Letters Patent under the Great Seal of Great Britain, bearing date
at Westminster, the Fourth day of December (1845), in the ninth year of
Her reign, did, for Herself, Her heirs and successors, give and grant unto
me, the said Robert Rettie, my exors, adññors, and assigns, Her especial
licence, full power, sole privilege and authority, that I, the said Robert Rettie,
my exors, adiñors, and assigns, or such others as I, the said Robert Rettie,
my exors, adñiors, or assigns, should at any time agree with, and no others,
from time to time and at all times during the term of years therein expressed,
should and lawfully might make, use, exercise, and vend, within England,
Wales, and the Town of Berwick-upon-Tweed, and in the Islands of Guernsey,
Jersey, Alderney, Sark, and Man, and also in all Her said Majesty's Colonies
and Plantations abroad, my Invention of "AN IMPROVED METHOD OF SIGNALIZING
OR TELEGRAPHING ON SEA OR LAND, PREVENTING COLLISION AT SEA, AND GIVING
SIGNALS OF DISTRESS, BY IMPROVED BURNERS WITH GLASSES COLORED, AND SIGNAL
CARDS APPLICABLE TO RAILWAYS IN ALL THE VARIOUS DEPARTMENTS, AS WELL AS
PREVENTING OF ACCIDENTS WHEN THE TRAIN IS AT FULL SPEED, SHEWING THE STATE
OF THE TIDE IN HARBOURS, ALSO THE DIURNAL FOR RAILWAYS, TOWNS, VILLAGES,
&c. &c. ;" in which said Letters Patent is contained a proviso that I, the said
Robert Rettie, by an instrument in writing under my hand and seal, shall
cause a particular description of the nature of my said Invention, and in what

page_text: manner the same is to be performed, to be inrolled in Her said Majesty's
High Court of Chancery within six calendar months next and immediately
after the date of the said in part recited Letters Patent, as in and by the same,
reference being thereunto had, will more fully and at large appear.
NOW KNOW YE, that in compliance with the said proviso, I, the said
Robert Rettie, do hereby declare the nature of my said Inventions, and the
manner in which the same are to be performed and carried out, and are
described by the following statement thereof, reference being had to the
illustrative Drawing hereunto annexed, and to the figures and letters of
reference marked thereon, that is to say :--
My Invention of an Improved Method of Signalizing or Telegraphing on
Sea or Land, Preventing Collision at Sea, and giving Signals of Distress, by
improved Burners, with Glasses colored and Signal Cards applicable to
Railways in all the various Departments, as well as preventing Accidents when
the Train is at full Speed, shewing the State of the Tide in Harbours, also
the Diurnal for Railways, Towns, Villages, &c., consisting,-
"First, as regards my Invention which has reference to an improved method
of signalizing or telegraphing on sea or land, in the application of colored or
white lamps, peculiarly arranged and combined, as herein-after fully described
and set forth.
Secondly, as regards that part of my Invention which has reference to pre-
venting collision at sea, my Invention consists in the application of a signal.
lamp of peculiar construction placed upon the bow of the vessel or quarter,
such lamp being furnished with flat sliding glasses of different colors; green
and red, which shew starboard and larboard, or right on with the white or
clear glass.
Thirdly, as regards that part of my Invention which has reference to
showing the state of the tide in harbours. My Invention consists in a new
and peculiar arrangement of certain colored sliding glasses, green and red,
which are presented to view by the action of the rising or falling of the tide
operating upon a float in connection therewith; or in cases where the locality
does not admit of the action of the water as a moving power, I propose to
employ any mechanical arrangement or combination of moving power for
effecting the same.
Fourthly, as regards that part of my Invention which has reference to the
diurnal for railways, towns, villages, &c., my Invention consists in the appli-
cation of a frame made of metal, porcelain, glass, or wood, papier maché, or
any substance suitable or applicable, furnished with one or more glasses, behind
which is to be placed the written or printed intelligence to be conveyed to the

page_text: public; and in order that such notice or notices may be rendered legible by
night as well as by day, I employ a powerful lamp or lamps and burners for
gas or oil of a new construction, as herein-after fully described, which I
arrange or dispose as represented by the Drawing hereafter referred to; and
this principle of construction is also applicable to the purposes of exhibiting
the names of professions, trades, and such like purposes.
Fifthly, as regards that part of my Invention which has reference to improved
argand or gas burners and glasses, my Invention consists in certain new con-
structions and arrangements of parts, by which the air is introduced into the
burner at a great heat, and combustion is rendered more perfect and a more
intense light thereby obtained than by the argand burners hitherto in use.
Another part of my said improvements in burners consists in a new form of glass
or chimney to be used therewith. And in order to explain my said Invention
as completely as possible I will proceed to describe the mechanical combina-
tions, arrangements, and construction, of the parts which I consider best
calculated for carrying my said Invention into practical effect. The burner and
glasses being made so contracted at the throat and gradually widening at the
top, allows the air to ascend with greater rapidity; and having been heated to
a great degree the oxygen is supplied with greater volume and adds consider-
ably to the purifying of the gas, at the same time destroying the shadow which
otherwise impeded the light when descending down upon the table, by reducing
the size of the burners and giving only a small ring of metal in both gas and
oil burners; and from the reduction of the size of the burner it allows a
greater number to be introduced into the reflector, and giving out a more

page_text: nals being produced by shifting the red and green colored slides. Figures 3
and 4 exhibit an arrangement of parts to be employed for telegraphing or
giving signals on railways by the aid of colored glasses: white, go on; green,
slow; red, danger; these lamps being made to give intelligence up or down
the line at the same time, which plan I claim as applicable to mostly all the
various departments of railways. The Figures 4* and 4** exhibit the colored
glasses detached from the last-mentioned lamp. Figure 5 exhibits a side
elevation of a plate-layer's railway hand lamp for telegraphing or giving signals
by night or day on railways. Figure 6 exhibits the parts of the same lamp
for fixing into the ground for convenience of the workmen. Figures 7, 7*, and
7**, exhibit two batons or staffs for flags or day signals and walkingstick for
the use of servants, and other persons employed on railways, for giving signals
by flags contained therein. Figure 8 exhibits a diagram illustrative of an
arrangement to be employed for the purpose of preventing accidents to railway
trains in full speed. Figure 8* exhibits parts hereafter referred to. Figure 9
exhibits an elevation of a tidal harbour lamp for registering and exhibiting or
telegraphing the height of the tide in harbours. Figure 9* is a transverse
and vertical section thereof. Figure 10 is a modification of the last-men-
tioned tidal lamp. Figure 11 is a front elevation of a diurnal for railways,
towns, villages, &c. Figure 12 is a top plan view thereof. Figure 13 is an
elevation of a new construction of argand burner and glass or chimney which
is represented attached thereto. Figure 14 is an elevation of the said glass or
chimney detached from the burner. The Figures 15, 16, 17, shew glasses
of another form of construction used for the new oil and gas burner or spirit
lamps. Figures 18, 19, and 19*, represent glass holders of brass or wire
netted. Figures 20 and 21 represent two views of wick holders. Figure 22
exhibits a transverse and vertical section of a roof lamp for railway carriages
with reflector and glass on a new principle, for giving extra light, the top
being of the usual form, but admitting air into the lamp by a bent tube.
Figure 23 is a top plan view thereof. Figure 24 exhibits an elevation of a
miner's lamp. The Figure 24* exhibits an elevation of a lamp which I desig-
nate a fighting lamp. Figure 25 represents an elevation of a lamp with a
revolving shade. Figure 26 is a transverse and vertical section thereof.
Figure 27 exhibits an arrangement of variegated lamps and foliage applicable
to public buildings. Figure 27* exhibits a foot light to be applied to the
stages of theatres. Figures 28 and 29 exhibit two views of a reflector with
burners attached thereto. Figure 30 exhibits a mechanical arrangement and
combination of parts to be employed for telegraphing or signalizing on steam-
boats; similar letters of reference are placed upon and denote corresponding

page_text: parts in so far as such parts appear or can be seen at each of the Figures. At
the Figures 1 and 1*; A, A, marks the topmast of a sailing ship; B marks
the crosstrees; C marks a signal lamp, the glass of which is white; D marks
a signal lamp, the glass of which is colored green, making a signal of distress
I
from a sailing vessel, also a signal of distress from a steamer. propose to
expose to view a white light attached to the topmast, and a red-colored lamp
at the crosstrees; and in order that each lamp may be distinctly seen, I con-
struct that part of the lamp which contains the light of glass, so that it may be
seen from any point of the compass or by any vessel passing or should a boat
or boats be wanted from the shore, I have another mode of making signals; as,
for instance, when a boat or pilot is required from the shore or I hoist one
bright light at the topmast, or encrease the number of lights for each boat
you want to come off to you. I employ signal cards, upon which are printed
a code of signals, as represented at the Figure 1** of the annexed Drawing,
suitable for sailing vessels, steamboats, railways, &c. &c. The Figure 2*
represents a lamp which I call a steering lamp, the construction of which is as
follows:-E, E', mark flat colored glasses, which may be shifted between the
white fixed glass or bull's eye F and the burner of the lamp, by means of the
handles G, G, affixed to each slide, whereby the color, all green or red, may
be given starboard or larboard, as may be required and in accordance with tho
before-mentioned code of signals; that is to say, the exhibiting of a real color
signifies starboard, and a clear or bright color going right on; and if necessary
I construct this lamp with two sets of colored glasses, by which the same
signals may be given fore and aft of the vessel, or from larboard to starboard,
or back to front of the lamp at one and the same time. And I would remark,
that, in the application of lamps with colored glasses at railway termini, three
distinct and separate sides or boxes, each having a glass of different color, may
be employed, each glass being provided with a distinct and separate burner
and reflector all contained in one lanthorn.
And I would further remark, that I propose to apply colored glasses to the
lamps of coaches, carriages, gigs, and other like vehicles, as the distinctive
mark of the right and left. And for omnibuses running to and from railway
termini or stations, I propose to employ different colored lamps to distinguish
the different railway stations to which each omnibus belongs, as also to distin-
guish what part of the city, town, or village each omnibus is going to.
Another mode of constructing signal lamps with colored glasses for making
siguals on railways or at sea is, the shades moved diagonally or in a circular
way round the centre pin, shewing from one to six colors, if required, is repre-,
sented at .Figures 4 and 4*, where it will be seen that the colored glasses

page_text: marked E, E, at Figure 2, instead of moving horizontally in a straight line,
are caused to describe a circle by being attached to pieces or arms H, H,
whose centre of motion is upon a pin I, at the outer extremity of which there
is a lever K, to the ends of which there are attached chains or rods L, fur-
nished with handles for pulling the colored glasses into their places to
cover the inner surface of the fixed glass F. Another mode of arranging
colored glasses in lamps for the purpose of giving signals is represented at
Figure 4, where A marks a circular piece or plate of metal having holes formed
therein in which are fixed the colored glasses 1, 2, 3, 4, 5, 6, and these glasses
are attached to the lamp by a pin or stud B passing through the plate A,
which is the centre of motion of the said plate; but only one color is seen at
a time. At the Figure 4, C marks a plate placed in front of the plate A,
the plate C having an opening formed therein, in which is placed a white
glass or bull's eye, through which pass the rays of light from the burner of
the lamp; D marks a handle fixed to the plate A for the purpose of interposing
entirely or partially one or other of the before-mentioned colored glasses
between the burner and the white glass according to the code of signals laid
down. At the Figure 5, which represents the plate-layer's lamp for giving
day and night signals, A, A, marks a lamp with three colors, white, green,
and red, at the back of which there is a socket containing a series of sliding
or telescopic tubes, B, B, the flag is contained inside the handle for making
a signal by day. At the Figure 6, D marks a stake, the upper end of which
receives the laup, and the lower end is shod with metal for the purpose of
readily fixing it in the ground. And in order that this instrument may be
rendered available for the purpose of making signals by night, I employ
sliding or moveable colored green and red glasses, which may be arranged
and actuated as before described in reference to Figures 4 and 4*, in which
case the sliding tubes may be closed and the flag dispensed with.
Another construction of instrument to be employed for the purpose of making
signals by day, is shewn at Figures 7 and 7*, which represent a staff and
baton composed of sliding or telescopic tubes to hold flags, which, by drawing
out the said tubes, are kept clean. I would remark, that this principle of
construction may be carried out in a variety of ways, such as in the represen-
tation of ornamental walkingsticks or canes, as shewu at Figure 7**, or
other like articles.
Another mode of making signals on railways by night, and more
particularly intended as the medium of communication between the guard
of a train and the engine driver, is represented at Figures 8 and 8*, where A
marks a lamp, the front of which is furnished with a red-colored glass
:

page_text: significant of danger or notice to stop; and to the front of the lamp and at
the lower edge thereof, there is attached by a hinge joint B the door C,
to the upper part of which there is fixed a piece of tubing D, and a similar
piece of tubing E is fixed to the lower part of the lamp A, and into this
latter piece of tubing there is inserted a bolt F, to the lower end of which there
is attached a chain G, the other end of such said chain being connected by
a hook to the end of a rod at Figure 8*, and upon the top of each of the
carriages, where the guard sits, I place and connect together each of such
chains for sliding rods G, by which the guard is enabled to withdraw the
bolt F from the tubing D, thereby disengaging the door, and allowing it to
fall by its gravity, and by the aid of a spring, the effect of which, through the
agency of a spring, is to ring the bell H, by which the engine driver is informed
of a signal having been made as denoted by the red glass being exposed to
his view.
Another medium of communication between the guard of the railway
train and the engine driver is represented at Figures 3 and 3*, which arrange-
ment is to give the engine driver a hint to stop. I employ a reflector of
highly polished metal or glass as shewn at Figure 3*, which I affix to the
funnel of the engine or other part where it can be best seen by the engine
driver, and in the case of a train being on fire it would be reflected thereon.
I also place a lamp of the construction shewn at Figure 3, called the guard's
carriage-roof day and night signal lamp placed on the roof of that carriage
upon which the guard sits, commanding a view of the engine, by which he is
enabled to make signals to the engine driver, such as by exposing a red or
green light by means of the handle 1,-the order to stop red, and green slow,―
by the light being thrown upon the said reflector. The Figures 9 and 9*
represent a lamp which I call a tidal harbour or river light, intended to be
used on piers in harbours, or as a river light, to show the state of the tide by
day and night. A, A, marks a pillar which is cast hollow for an iron rod
with pipe B connected, fitted with a float C and rod D is made fast, and to
the upper end of the said rod there is fixed the frame containing green and
red flat colored glasses, E, F, one or other of which are seen at the opening G of
the lamp, the float to be in the position shewn at Figure 9* when it is low
water, and the red glass F to occupy the opening G, the colored glasses E and
F, by which the green glass at high water will be made to occupy the place
of the red one, and thereby point out to vessels by night the state of the
tide; and the same may be done by day, by having a red and green slide H.
attached to the rod D working through a slot or opening I. In some cases.
the day or night signal of high and low water, or other state of the:tide,

page_text: may be effected by mechanism or manual labour, as found most desirable, by
green and red boards displayed in a similar way by day. The construction of
the tidal lamp represented at Figure 10 may also be rendered available for
the purpose of making signals on railways. The construction and arrange-
ment of the diurnal represented at Figures 11 and 12 is as follows:-A, A,
a pillar supporting a frame B, which may be divided into compartments for
the reception of the several distinct and separate notices to be advertised.
This frame is furnished with one or more glasses by which such said notices
are rendered legible by day, and are protected from weather and dirt; and in
order that such notices may be legible by night I attach a lamp or lamps
C, C, at the back of the said frame, as shewn at Figure 12; and although I
have shewn only one mode of carrying out this principle it will appear evident
that the same may be done in a variety of ways and for a variety of purposes
without departing from the spirit of my said Invention, and lighted behind
at night. B marks a gallery or glass holder, upon which is placed the glass
or chimney, the form of which is better shewn at Figure 14, and the arrows'
flight at Figure 18 denote the course of the air to the flame. And I would
remark, that the peculiar feature of this part of my Invention consists
firstly in the formation of the glass being wider at the top C than at
the part D, where the air is made to impinge upon the flame by the
shoulder or indentation at the neck or throat, by which the draught or
quantity of air passing through it is considerably increased; and secondly, by
arranging the glass or chimney with respect to the burner in the manner
shewn the air is more favorably admitted to the flame and combustion
thereby rendered more perfect. The form of the glass or chimney, shewn at
Figure 15, differs from the last-mentioned one in the following respects:-It
will be seen, upon referring to this Figure, that the bottom of the glass is
formed internally with a cone of glass A, by which the air is brought into close
contact with the flame, encircled by the said glass or chimney. The glass,
shewn at Figure 16, differs from those lastly mentioned by forming the bottom
edge thereof with a lip or projection A; and the said glass or chimney is sup-
ported around the burner by two circular metal holders B and C, shown at
Figures 18 and 19. The upper and conical-shaped portion D of the holder B
supports the glass by the under-surface lip or projection A resting thereon,
whilst the inner surface of the lip A holds it firmly in the required position.
The construction of the glass holder, represented at Figure 19*, is a small
sliding catch, with thumb nut for fixing it, so as to retain firmly the glass, and
allow the moon to rest. Figure 17 is also intended for oil lamps. The
Figure 20 represents a circular wick of cotton for oil burners, and Figure 21

page_text: The
a wick holder for the said wick. The Figure 22 exhibits the construction of a
lamp for the roofs of railway carriages. A, A, marks a reservoir for oil; B,
the burner connected thereto; C, the glass shade; D, the glass chimney;
E, screw stopper and reflector under the bottom. The construction of the
miner's lamp, represented at Figure 24, is as follows:-A, A, marks the oil
lamp, upon which fits the body B of the lamp, which is of glass, of various
shapes, and is surmounted by a cap C of wire gauze, through which the smoke
and vitiated air pass, the supply of fresh air necessary for combustion being
admitted through the gauze wire placed around the pipe D; and to protect
the glass B from injury, I place a wire netting, or cover E over the same.
The intensity of the light is improved by the application of a glass chimney F,
of the shape shewn. G marks a reflector. The lamp is so arranged and
locked together that workmen using the same have no access to the interior.
The construction of the lamp, exhibited at Figure 24%, and which I designate
a fighting lamp, is moveable by the handle to close it up with ease.
stem B is for the bracket C, which is affixed to the side of the ship. D marks
an opening, which is furnished with horn, glass, &c. The inner surface may
be made to cover or expose the rays of light, as occasion may require or cir-
cumstances deem necessary, by turning the handle F, which is attached to the
said plate. The construction of the lamp, with revolving shade, shewn at
Figures 25 and 26, is as follows:-A, A, mark the burners of the lamp, sup-
ported by the plate B and bracket C. D marks a spindle, on which spindle
the fly revolves with the colored cylinder. F marks a circular revolving fau,
fixed upon the spindle D. G marks an ornamental painted cylinder, of paper,
silk, or gauze, the upper end of which is attached to the fan F, and the lower
end is open and unsupported. H marks a cylinder of glass, outside, to protect
it from the weather, upon which is painted any design suitable for the pro-
fession or trade. The lower end of this glass is attached to and rests upon the
plate, which has openings formed therein for the passage of air to the burners.
The upper end of the glass cylinder H is attached to the top E of the lamp,
and the bottom, as shewn. The fan F will impart rotary motion to the paper
shade G, which is attached thereto; and such motion will continue so long as
there is sufficient heat given off from the burners; but the effect is given by
the design upon the glass cylinder outwardly. The Figure 27 exhibits an
arrangement and combination of varigated glass lamps, marked A, A, pecu-
liarly formed to represent fruit and flowers, which I arrange or dispose in
divers ways amongst foliage of glass, denoted by B, B, and the leaves made of
glass. And I would remark, that the peculiar feature of this part of my said
Invention consists in the forming of varigated lamps in the shape of fruit and
flowers, and introducing them in scenes in gardens on the stage of a theatre,

page_text: and in forming the foliage of glass, and arranging or disposing the same in
whatever manner taste may suggest; which lamps have tops or covers of tin or
metal to keep them from rain or wind, the gas tubing and cocks being used to
represent branches of trees, &c., or for figures, grottoes, and other designs in
the interior or exterior of buildings. The foot light, represented at Figure 27*,
is similar in its construction to that shewn at Figure 2, and differs therefrom
only as regards the shape for giving colored or plain light upon the stage
without coming on the audience. The construction and arrangement of the
reflector and burners, represented at Figures 28 and 29, are as follows:-
A, A, marks a highly polished concave reflector, of metal or glass, to which
are attached burners B, B, for gas or oil. And I would wish it to be under-
stood that, although I have only shewn the reflector with three burners
attached thereto, I do not confine or limit myself to this number, but propose
to employ as many as the size of the reflector may require, the peculiar
feature of this part of my said Invention consisting in the application of more
than one burner to a reflector or reflectors; by which I obtain a more extended
and uniform diffusion of the rays of light over the entire surface of the said
reflector, and thereby produce a very powerful glare of light for beacons, light-
houses, &c. &c., being new and original. I claim this steam indicator,
Figure 30. A, A, marks the gangway of a steamboat; B, B, the engine
room; C, C, the boiler room, through which there extends, in a vertical
direction, the following parts:-A', A', marks a hollow shaft, having bells
B', B', and lamps C, C, attached thereto, as shewn. The lower end of the
shaft A' has a pointer or arm D' affixed thereto; and to the upper end of the
said shaft there is affixed, in the same direction, another pointer E¹, the
opposite end of which is formed with a handle F'. G', a flat circular index
plate, upon which are engraved or written the requisite orders to be given to
the engineers, such as slow, ease, go on, stop; and there is another and similar
index plate situate in the engine room. Hmarks a rod, which passes through
the hollow shaft A'; and I' is an index plate, with the words shut and blow
off marked thereon. The rod H' communicates with the throttle valve of the
engine and with the boiler, either for shutting off or blowing off the steam;
thus, it will appear evident that the captain or other person on deck can at
all times have the control of the engines, and can give orders without the aid
of a call boy for that purpose.
Having now described the nature of my said Invention, and in what manner
the same is to be performed and carried into practical effect, I desire it to be
distinctly understood with respect to that part of the title of this my said
Specification which has-reference to an improved method of signalizing or
telegraphing on sea or land, preventing collision at sea, and giving signals of

page_text: distress, with glasses colored, and signal cards applicable to railways, an all
the various departments, as well as preventing accidents when the train is at
full speed, that what I claim as my Invention is,—
Firstly, the arranging or disposing of plain and colored lamps amongst the
rigging of vessels, for the purpose of giving signals as described and referred
to in respect of Figures 1 and 1*.
· Secondly, the arrangements and combinations represented at the Figures
2, 2, 3, 8*, 4, 4*, 4**, 5, 6, 7, 7*, 7**, 8, 8*, 24, 24, 25, 26, 27, 28, 29,
of the annexed Drawings, and for the purposes herein-before particularly
described with reference to such Figures.
Thirdly, the application of different colored glasses to the construction of
coach, carriage, and gig lamps, as a distinctive mark of the right and left, red
and green; and, further, in the application of colored glasses to omnibuses,
for the purposes and in the manner herein-before particularly described.
Fourthly, as regards that part of the title of this my said Specification,
which has reference to the state of the tide in harbours, also the diurnal for
railways, towns, villages, &c., and improved burners, I claim the combinations
and arrangements represented at Figures 9, 9*, 10, constituting a pier,
barbour, or river tidal light to be used for the purposes herein-before particu-
larly described with reference to such Figures.
Fifthly, the combinations and arrangements represented at Figures 11 and 12,
constituting a diurnal, to be used for the purposes herein-before particularly
described with reference to such Figures.
Sixthly, the combinations and forms represented at Figures 13, 14, 15, 16,
17, 18, 19, 19, 20, 21, and constituting burners, glasses, and holders, to be
employed in combination with the arrangements before described and referred
to, and to be used more particularly for the purposes of making signals in the
manner herein described.
Seventhly, the peculiar construction of the signal lamp represented at
Figure 27.
Eighthly and lastly, the mechanical combinations and arrangements of parts
described and referred to in respect of Figure 30, for the purpose of signalizing
on steamboats, sailing vessels, preventing collision at sea by steering straight
on a bright light, green and red, left and right, also to the burner no
shadow.
In witness whereof, I, the said Robert Rettie, have hereunto set my
hand and seal, this First day of June, in the year of our Lord One
thousand eight hundred and forty-six.
ROBERT (L.s.) RETTIE, C.E.

page_text: AND BE IT REMEMBERED, that on the First day of June, in
the year of our Lord 1846, the aforesaid Robert Rettie came before
our said Lady the Queen in Her Chancery, and acknowledged the Speci-
fication aforesaid, and all and every thing therein contained and specified,
in form above written. And also the Specification aforesaid was stamped
according to the tenor of the Statute made for that purpose.
Enrolled the Fourth day of June in the year of our Lord One thousand