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Full text of "Modern Mechanical Engineering Vol-I"

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The Safe
The protection of drawings, tracings, and books, from loss by fire,
theft, or careless destruction, is important. The safe is usually a strong-
room, a room built of brick and iron, asbestos-lined, and provided with
steel-shuttered windows and steel doors. The safe may be of con-
siderable dimensions, and is generally staffed by a man in charge and
one or two office-boys. The safe should be well fitted up with drawers,
pigeon-holes, serving-table, voice-tube connections to chiefs room and other
departments, and should be well lit and ventilated.
When a new tracing is made and checked, it should be at once given
into the custody of the safe-man, who will enter it up in his book, also the
date of receipt. This entry will be transferred to his permanent tracing
register, where it will be entered under the proper job and drawing number.
The original drawing, which will be passed in at the same time, will be filed
away, probably in another part of the building, as it will not usually be
required again. In any particular job the drawings may number anything
from 20 to 200, and probably in certain cases many more. It will usually
be found undesirable to roll up more than ten or twenty tracings together.
Drawings i to 10 will be in one roll, n to 20 in another, and so on. These
rolls are best kept in japanned tins to keep them from dust and damp, or,
failing that, in canvas covers. They should always be very carefully rolled
up and handled, the surface never being cracked nor the corners allowed
to be folded back. Every crack in the tracing means a line not intended in
the print.
Tracings are only given out for photographic purposes, or when it is
intended to alter the tracing; and when a tracing or a print is given out,
the date of issue and the draughtsman's name should be jotted down in a
day-book kept for that purpose.
When a new tracing is given in, the safe-man should see to it at once
that the proper office copies arc taken off, as prints are now almost universally
recognized as the standard form of drawing-office copy.
The same procedure will be adopted with the prints and sketches received
from outside, or copies of sketches sent out, except that, in the latter case,
it would be the only available copies which would be given out when
All the order-books are kept in the safe, and occasionally the data-books,
although these latter are more generally kept in an ordinary small iron safe
in the chief draughtsman's room.
Estimate drawings are, of course, entered up in an estimate-book and
filed away appropriately.
In the best firms no one but the safe-man, and whatever assistants he
has, enters the safe, all transactions taking place over a counter. The drawing
required is called in, and it is usually left to one of the office-boys, attached
to the safe, to bring it down to the draughtsman who requires it. These