A-A-52024
Compass dial. The compass dial shall be marked to indicate the four cardinal compass points. East and west point shall be transposed 180 degree from normal map positions. A clinometers scale for reading vertical angles shall be graduated in 1-degree increments for 180 degrees, and numbered every 10 degrees in both directions from zero to 90 degrees. The zero point shall coincide with the west cardinal point on the compass dial.
Raised compass ring. The raised compass ring shall be graduated in single degree and numbered every 10 degrees in both directions from zero to four 90-degree quadrants. A mechanism shall be provided to adjust the azimuth of the raised compass reading for declination. The mechanism shall be enclosed within the compass box except for the operating pinion, which shall extend through to the outside of the compass box terminating in a slotted screwhead to facilitate the adjustment from outside the compass box. The mechanism shall be nonmagnetic, corrosion-resistant metal and shall be constructed in such a manner that dust or moisture cannot enter the compass box where the adjustment screw terminated. A fixed index pointer shall be permanently secured to the inside wall of the compass box and shall extend over the raised compass ring to serve as a reference point for adjusting the raised compass ring. The index pointer shall coincide with the north point of the compass dial.
Pendulum clinometers. A clinometers pendulum shall be enclosed in the compass box for reading vertical angles when the compass is placed vertically on its edge on a level surface. The pendulum shall swing freely from an axis concentric with the pivot of the position of the pendulum against the clinometers scale on the compass dial.
Spirit level. A circular hermetically sealed spirit level for leveling the compass shall be located and secured to the inside of the compass box. The level shall not cover any essential inscriptions.
Compass box. The compass box shall not be more than 4 inches in diameter.
Magnetic needle. The magnetic needle shall be not less than 3 inches long and shall be equipped with a stop and a jewel setting.
Folding sights. Two folding sights shall be secured to the compass box by not less than two screws foe each sight. The sights shall be hard forged brass or bronze and shall be constructed to permit their being raised to a vertical position for sighting objects or to be folded down the flat over the compass glass when not in use. When in the vertical sighting position, the sights shall project.
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