Testing of Magnetic Compasses |
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Page 276
... magnetic disturbances which will cause a change in the direction or in- tensity of the magnetic field . When the table index has been adjusted by means of the stand- ard compass the instrument to be tested is replaced on the stand and ...
... magnetic disturbances which will cause a change in the direction or in- tensity of the magnetic field . When the table index has been adjusted by means of the stand- ard compass the instrument to be tested is replaced on the stand and ...
Page 278
... magnets such as are used for compensating or adjusting compasses . It is prefereable to carry out this kind of work in a place very free from magnetic disturbances . It is because this condition is not realized at the Bureau that higher ...
... magnets such as are used for compensating or adjusting compasses . It is prefereable to carry out this kind of work in a place very free from magnetic disturbances . It is because this condition is not realized at the Bureau that higher ...
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