A-A-52034A
adjustable needle and the other leg shall have an interchangeable pen holder and pencil holder. The pen holder or the pencil holder shall be held firmly in place without movement when tightened. The pen holder portion shall have pen blades conforming to ruling pens, above. The pencil portion shall accommodate leads conforming to pencil leads, above.
Lengthening bar. A lengthening bar or beam not less than 3.5 inches long shall be provided for use with the large compass to permit drawing larger circles than are normally possible with the compass alone. The lengthening bar or beam shall fit into the socket for the pen or pencil attachment, and the pen or pencil attachment shall fit into the lengthening bar or beam.
Small divider. The small divider shall be similar to the small bow compass specified in this document, except that both legs shall have adjustable and replaceable needle points as specified herein.
Large divider. The large divider shall be friction type and shall be between 6 and 6.5 inches long. Both legs shall be equipped with adjustable and replaceable needles as specified in needle points cited herein. The range, or spacing between the points shall be continuously variable from less than 0.062 inch to more than 2.5 inches. Movement shall be free without binding or tight spots. The friction shall be sufficient to hold the dividers in any position during normal use.
Center horn. The center horn shall be a flat disc of transparent plastic mounted in a metal or plastic rim. The plastic disc shall be between 0.50 and 0.625 inch in diameter. The rim shall be equipped with three equally spaced needle-sharp pins protruding between 0.046 and 0.078 inch below the lower surface of the metal rim.
Additional Darts and Dencil lead holders. Additional parts and pencil lead holders may be in two separate holders or they may be combined into a single holder. Each holder shall be provided with a friction or threaded type removable cap. The holder shall contain not less than the following items:
3 Pencil leads.
3 Needle points.
2 Adjusting T-bolts and nuts (when required).
2 Eye bolts and clamp nuts (when required).
Screwdriver. When required for making adjustment on any instrument in any set, a screwdriver of the proper size shall be furnished with the set.
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