A-A-52034A
attachment in the case. The inside of the case, including that part that covers the instruments when the case is closed, shall be lined with dark colored velvet, velveteen, or plastic foam rubber. Fasteners shall be provided to keep the case closed when not in use Fasteners and hinges shall be corrosion-resisting metal.
Ruling pens (except contour and railroad pens). Pen blades shall be spring-blade, spring-hinge, or cross-hinge types. Blade points shall have a hardness of 47 ±7, on the Rockwell C-scale or equivalent. The blades shall be sharpened and set, and shall be adjustable to permit drawing clean, uniform, unbroken lines between 0.006 inch and 0.03-inch wide on drawing paper, tracing cloth, and on matte-surfaced plastic sheet. The points shall not cut into the drafting medium under normal use.
Ruling pen handles. Ruling pen handles shall be rigid plastic or metal, and shall be between 0.187 and 0.25 inches in diameter.
Small ruling pen. The small ruling pen shall be between 4.5 and 5.5 inches long, The blade portion shall be 2 inches, tO.25 inch, long.
Large ruling pen. The large ruling pen shall be between 5.5 and 6.5 inches long. The blade portion shall be 2 inches, kO.25 inch.
Bow compass. The action of the legs of the bow compass shall be controlled by a center adjusting thumbscrew. The adjusting screw shall open and close the spacing firmly and smoothly and shall hold the legs rigidly while drawing circles.
Small bow compass. The small bow compass shall be between 3.5 and 4.5 inches long, and shall permit drawing circles from 0.031 inch to at least 2 inches in diameter.
Compass pen. The compass pen shall be provided with a removable and adjustable needle in one leg and a ruling pen in the other leg. The pen blades shall be as specified in the paragraph on ruling pens, above, except that the maximum width of the line shall be 0.03 inch.
Compass pencil. The compass pen shall be provided with a removable and adjustable needle in one leg and a pencil-lead holder in the other leg. The pencil-lead holder shall accommodate the pencil leads as specified above.
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