Year: 1874

alton. In one corner near to- the


lathe are examples Of. their boil


threading machines; they cut the


bolt with closed dies at a single oper-
alton and the dies open to release
the finished bolt-this is effected au-


tomatically without stopping the dies
but the curious and interesting
part of this machine is the manner
in which the oil is fed to the dies,


being forced up from a reservoir by
q pump, it enters the die hold, back
of the dies, and flowing out through
these washes out the chips as cut
from the bolt and floods the cutting
dies to lubrcate them and keep them
cool. There is little surface grind
ing machine with an emory wheel in


the centre of plane surface and |
have been shown steel straight edges
which have been ground up in this


little tool so accurately as'to be able,


when pressed tightly, edge to edge,


to cohere-one straight edge sup
porting the weight of another below


by the cohesion only. A drill grind
ing machine for sharpening twist and
straight drills so the cutting lips are
of equal lengths; they also show
slotting machines; shaping ma
chimes, curious and perfect enough


in their way but one is naturally at
tracted to the wonderful machine
for cutting gear wheels IN the South
east corner OF the enclosure. This
machine takes a blank wheel and
cuts and spaces all the teeth, per
forming all the required motions OF
feeding the revolving cutter across
the face Of the wheel, then driving
it back, turning the wheel round to
a new place and then starting the
feed anew-thus enabling the ma
chine to dispense with an attendant


during the time it is in operation
| have been informed the tool is one
of the best illustrations OF what can
be accomplished by machine tools,
as it is said to do 5O per cent. more
work in q given time than If led by
hand, thus enabling one man to at-
tend or run several machines. A GU
rious machine stands near this tool
which dresses up all six sides OF hex
ngonal nuts at one operation-giving
them very fine finish. The nuts
are strung on mandfil and pass
through cluster of revolving cut
ters, they show also, a novel arrange
ment of drill pipes, both stationary
and radical in which the splndles OF
both are driven directly by belt,
without the intervention OF gears
In the centre OF the space stands a
table covered with a great collection
OF Injectors for feeding steam boilers
with water This firm was the nrst
to make this instrument IN this coun-
try, and have introduced many I'M
provements ON the French invention;
u large stand shows examples OF
hangers, pulleys and all the parts
that go to make up what IS known as
shifting. The line shaft extending
the entire length of the building for
the exhibition work, IS made by
them, and drives all the iron work
ing machinery in the hall. Apart
from the group of tools Just describ-
ed, in the area where the boiler IS
placed, is q very fine example OF
Steam Hammer-the Hammer bar IS
of solid wrought iron and weighs
800 pounds, 1t is designed for quick
running and will strike automatically
$50 6to@S per minute; to this ham
mer is attached q device that enables
the blow to be made very light with
ort materially dimishing the number
of blows; this feature is said to be
of great use in finishing steel; access
to the area where the hammer IS to
be seen is obtained either by starr
~ ,,,L;ob o,,oro4oe Tho
platform of this elevator was made
by this firm while the platform is fur
nished with new and very curious
safety arrangement, the invention OF