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Bishop, J. Leander (John Leander), 1820-1868 / A history of American manufactures from 1608 to 1860 : exhibiting the origin and growth of the principal mechanic arts and manufactures, from the earliest colonial period to the adoption of the Constitution : and comprising annals of the industry of the United States in machinery, manufactures and useful arts, with a notice of the important inventions, tariffs, and the results of each decennial census
Volume 3 (1868)

Manufactures of Hartford,   pp. 406-423


Page 410

MANUFACTURES OF H1ARTFORD.
curved parts, prepare the frames for being introduced between hard steel
clamps, through which all the holes are drilled, bored, and tapped, for
the various screws ; so that, after passing through thirty-three dis-
tinct operations, and the little hand finishing required in removing the
burr from the edges, the lock-frame is ready for the inspector. The ro-
tating chambered cylinder is turned out of cast-steel bars, manufactured
expressly for the purpose. The machines, after getting them the desired
length, drill centre holes, square up ends, turn for ratchet, turn exterior,
smooth and polish, engrave, bore chambers, drill partitions, tap for nip-
ples, cut pins for hammer-rest and ratchet, and screw in nipples. In all
there are thirty-six separate operations before the cylinder is ready to
follow the lock-frame to the inspector. In the same manner the barrel,
forged solidly from a bar of cast steel, is bored and completed to caliber,
and is then submitted to the various operations of planing, grooving
the lower projection beneath the barrel, with which the base pin is ulti-
mately connected, tapped, and then rifled. The barrel goes through
forty-five separate operations on the machines. The other parts are
subject to about the following number : lever, twenty-seven ; rammer
nineteen ; hammer, twenty-eight; hand, twenty; trigger, twenty-one;
bolt, twenty-one ; key, eighteen ; lear spring, twelve; fourteen screws,
seven each, ninety-eight ; six cones, eight each, forty-eight ; guard,
eighteen; handle-strap, five ; stock, five.
Besides the exactness and uniformity which are arrived at by the
adaptation of machinery, there is additional security in the minuteness
of inspection to which each weapon is subjected. As soon as completed
and before being polished, the different parts are carried to the Inspect-
ing or Assembling Department, and there undergo a rigid examination.
The tools to inspect a cylinder, for example, are fifteen in number, each
of which must gauge to a hair so great is the nicety observed, and on
finishing his examination the inspector punches his initial letter on the
piece inspected, thus pledging his reputation on its quality. Again,
after the different parts have been finished, they are once more carried to
the assembling room, and each chamber is loaded with the largest charge
possible and practically tested by firing ; after which they are wiped out
by the prover and returned to the Inspection Department. The in-
spectors again take them apart, thoroughly oil and clean them, when
they are for the last time put together and placed in a rack for the final
inspection. The orders from the principals being perfection-the slight-
est blemish, a small scratch in the bluing or varnish, is sufficient to pre-
vent the arm passing this final inspection. But if passed, it is returned
o the store room and papered, and then transferred to the wareroom,
and is now ready for the market.
410


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