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adjustable index angle apparatus behavior Bureau of Standards calibration error card or scale cardinal points compass card complete period construction damping constant deflecting the compass degree of accuracy determine the magnetic earth's eccentricity exceed 15 seconds free from magnetic half period horizontal intensity incorrect graduation index line initial deflection logarithm lubber line magnet needles magnetic axis Magnetic Compasses magnetic disturbances magnetic field magnetic materials means ment mounted necessary netic field north and south noting the difference number of different opposite direction orientation oscillation PERFORMANCE CHARACTERISTICS Period.—The permanent magnet photograph pivot friction position of equilibrium preparation of specifications prisms ratio reading Sanford Scientific Papers shown in Fig sighting devices simple test slits small coil south points stand standard compass Standards Vol SUGGESTED PERFORMANCE SPECIFICATIONS suspended needle swinging telescopes Testing of Magnetic type of compass type of instrument variation various types vary in magnitude vertical plane passing vidual instruments workmanship