For reference we depend on our indices. Each tracing, when completed,
is entered under its letter in the numerical index, and is given the
next consecutive number, and laid in its place.
From this index the title and the number are copied into other
indices, under as many different headings as possible.
Thus all the drawings of any engine, or tool, or machine whatever,
become assembled by their titles under the heading of such particular
engine, or tool, or machine. So also the drawings of any particular
part, of all sizes and styles, become assembled by their titles under
the name of such piece. However numerous the drawings, and however
great the variety of their subjects, the location of any one is, by
this means, found as readily as a word in a dictionary. The stencil
marks copy, of course, on the blue prints, and these when not in use
are kept in the same manner as the tracings, except that only
twenty-five are placed in one drawer.
We employ printed classified lists of the separate pieces constituting
every steam engine, the manufacture of which is the sole business of
these works, and on these, against the name of every piece, is given
the drawer and number of the drawing on which it is represented. The
office copies of these lists afford an additional mode of reference
and a very convenient one, used in practice almost exclusively.
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