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A NEW METHOD OF KEEPING MECHANICAL DRAWINGS.[1]
[Footnote 1: A Paper by Chas. T Porter, read before the American
Society of Mechanical Engineers.]
The system of keeping drawings now in use at the works of the
Southwark Foundry and Machine Company, in Philadelphia, has been found
so satisfactory in its operation that it seems worthy of being
communicated to the profession.
The method in common use, and which may be called the natural method,
is to devote a separate drawer to the drawings of each machine, or of
each group or class of machines. The fundamental idea of this system,
and its only one, is, keeping together all drawings relating to the
same subject matter.
Every draughtsman is acquainted with its practical working. It is
necessary to make the drawing of a machine, and of its separate parts,
on sheets of different sizes. The drawer in which all these are kept
must be large enough to accommodate the largest sheets. The smaller
ones cannot be located in the drawer, and as these find their way to
one side or to the back, and several of the smallest lie side by side
in one course, any arrangement of the sheets in the drawer is out of
the question.
The operation of finding a drawing consists in turning the contents of
the drawer all up until it is discovered.
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