Testing of Magnetic Compasses |
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... performance characteristics of magnetic compasses together with a description of some of the apparatus which is used at the Bureau for testing . I Introduction ... II . Performance characteristics . 1. Pivot friction .. 2. Calibration ...
... performance characteristics of magnetic compasses together with a description of some of the apparatus which is used at the Bureau for testing . I Introduction ... II . Performance characteristics . 1. Pivot friction .. 2. Calibration ...
Page 274
... performance . In this paper it is proposed to consider briefly the factors governing the behavior of individual instruments rather than the design of compasses suitable for various purposes . II . PERFORMANCE CHARACTERISTICS The performance ...
... performance . In this paper it is proposed to consider briefly the factors governing the behavior of individual instruments rather than the design of compasses suitable for various purposes . II . PERFORMANCE CHARACTERISTICS The performance ...
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... specifications for various types of com- passes and ... characteristics of compasses were brought out which were considered to be of interest to users of magnetic compasses . This paper gives a brief discussion of the principal performance ...
... specifications for various types of com- passes and ... characteristics of compasses were brought out which were considered to be of interest to users of magnetic compasses . This paper gives a brief discussion of the principal performance ...
Common terms and phrases
adjustable index angle apparatus behavior Bureau of Standards calibration error CALIBRATION.-The 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 instant logarithm lubber line magnet needles magnetic axis Magnetic Compasses magnetic disturbances magnetic field magnetic materials magnetic moment means ment mounted necessary netic field north and south noting the difference number of different orientation oscillation PERFORMANCE CHARACTERISTICS permanent magnet photograph pivot friction position of equilibrium preparation of specifications prisms ratio reading Sanford Testing 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