So far as we know, this is the most practical and convenient method of keeping and cutting up drawing papers; and the plan of purchasing drawing paper in rolls and cutting it up into any desired size of sheets seems to be preferable to purchasing the paper in sheets of odd sizes and trimming it to the dimensions required. In the center, between the two drawing paper cases, are shelves for holding books, catalogues, etc. This case is located against the wall dividing the drawing room from the pattern shop, and convenient of access for the draftsmen.

Chief Draftsman's Desk.

Fig. 97. Chief Draftsman's Desk.

Case for Filing Drawings and Tracings.

Fig. 98. Case for Filing Drawings and Tracings.

Case for Filing Blueprints.

Fig. 99. Case for Filing Blueprints.

At the opposite side of the room, and against the stationary partition, is the case for filing tracings; and against the wall next to the machine shop a similar case is used for finished blueprints. It is of the form shown in Fig. 99, and has drawers constructed in the same manner as those in the case for drawings shown in Fig. 98. It is built higher than the latter to increase its capacity, although, of course, it may contain any number of drawings required for the work.

Many systems for filing and preserving drawings, tracings, and blueprints have been devised, but here again simplicity will be found best in practice, and by devoting one drawer to each machine, and properly indexing the drawings and tracings, the desired sheet may be quickly found, taken out, and replaced, with little disturbance to the others. Where the variety of the work makes it necessary to have a great number of classes it will be found that a more elaborate system is needed, but the plan proposed will be sufficient for a large majority of establishments. In filing tracings it is well to lay in a sheet of thin straw board between every ten or twelve tracings, or to divide the tracings of a machine into divisions representing the groups of parts of the machine, as, for instance, of a lathe, the headstock, tailstock, carriage, apron, etc. This helps to keep the tracings lying flat without wrinkles and aids in quickly finding the one needed.

Next to the chief's room a dark room is provided for photographic work, as every modern drawing room is expected to be able to make photographs of machinery and similar articles; and this branch of work should not be done in connection with blueprinting, owing to failures that may result from carelessness in handling the necessary chemicals.

In the opposite corner of the drawing room and next to the pattern shop is arranged a lavatory provided with twelve bowls for the use of the draftsmen and pattern makers. In connection with this are two water-closets, one of which opens out of the lavatory and is used by the pattern makers; the other opening from the drawing room is for the draftsmen's use. A large storage closet is included in the space devoted to the above purposes, and between this space and the rear wall is the stairway leading to the blueprint room above. A fire-proof safe of sufficient size should be provided for storing such records and original drawings of special devices as cannot be readily replaced, and such valuable papers as always accumulate in the drawing room.

In the central space of the room is a table 5 feet by 14, for large reference drawings and similar purposes. Drawers under this table are convenient for holding large construction sheets which cannot be filed in the regular cases without folding.

Against the partition of the chief's room is a row of lockers, one for each man. These should never be constructed of boards, or in any way tightly enclosed, but, as a matter of fire protection and sanitary cleanliness, should be open to a free circulation of air; and nothing which we have seen fulfils the conditions better, or perhaps as well, as what is generally known as the "expanded metal" used in many establishments for this purpose.

The above arrangement of the drawing room and its equipment is intended for cases where there does not seem to be the need of an expensive vault in which to store drawings, tracings, blueprints, etc. Still the want of this means of safety to such valuable records in case of fire has of late years been gaining in importance and would seem, in most cases perhaps, a good investment from the point of view of insurance. Hence an arrangement of the plans of both offices and drawing room has been made with this end in view, and is shown in Figs, 100 and 101. As a matter of economy the vault is built in a corner of the structure, the walls of which form two of its sides. For this purpose the superintendent's public and private offices are placed next to each other and the lavatory located between the latter and the vault, while the stairway leading to the drawing room is placed between the hall and the Purchased Parts Storeroom. This permits the vault in the drawing room to be built directly over the one in the offices and next to the chief's room, out of which it opens, without disarranging the plans to any considerable extent.

Fig. 100. Drawing Room Arranged for Storage Vault in one Corner.

The dark room is placed under the stairs leading to the blueprint room. The vault is provided with cases of drawers similar to those in the drawing room, and with racks for holding negatives, as well as shelves upon which may be stored any valuable records, memoranda, and similar articles. These vaults are 8 feet wide and 16 feet long, and have masonry floors and brick arches overhead. The walls should be 16 inches thick, exclusive of an air space of 1« inches in the center of the walls. Steel should not be used in their construction unless it is completely covered by brickwork, on account of its tendency to warp from the excessive heat of a fire. Double fire-proof doors should be provided, similar to those used in safes. The hinges should be held by bolts passing entirely through the walls, as should also be the case with bolts securing the door frames.