"
From the proof-room Hamilton's guide led him through different parts of
the works, where various machines were employed in preparing and
finishing the rough forgings he had seen made and annealed. Thus, for
example, in a receiver for a gun stock, one machine worked a bevel edge
on it, another bored it to the size of the gun barrel, accurate to the
thousandth part of an inch, another pierced the tiny screw holes, and
yet other machines made even the minute screw, done, as was explained to
Hamilton, so that the threads in each should fit with absolute
exactness.
"But do you really mean to say," queried Hamilton in surprise, "that
every one of these fifty or more parts of each gun is inspected and
tested?"
The official led him to a number of long rows of tables.
"Here," he said, "are girls doing nothing else all day long. Here is a
testing die for a part of the ejector of one of our 1911 models. You see
that there are two spaces for all of them. It must fit into this one, it
must not fit into that, which is a thousandth of an inch smaller. If too
big, you see it won't fit into either, if too small, it would fit into
the one where it ought not.
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