Testing of Magnetic Compasses |
From inside the book
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Page
... various types of compasses , the construction of special apparatus for testing purposes , and special investigations . The information thus obtained was utilized in the prepa- ration of specifications for various types of compasses and ...
... various types of compasses , the construction of special apparatus for testing purposes , and special investigations . The information thus obtained was utilized in the prepa- ration of specifications for various types of compasses and ...
Page 274
... types of instruments but also more detailed studies of individual features ... type of instrument for a particular class of service is governed by its design , but ... various purposes . II . PERFORMANCE CHARACTERISTICS The performance ...
... types of instruments but also more detailed studies of individual features ... type of instrument for a particular class of service is governed by its design , but ... various purposes . II . PERFORMANCE CHARACTERISTICS The performance ...
Page 277
... type of compass being tested is in general an indication of a variation in the ... types some kind of liquid is employed . This liquid has the double function ... various amplitudes of swing . It is necessary , therefore , in order to ...
... type of compass being tested is in general an indication of a variation in the ... types some kind of liquid is employed . This liquid has the double function ... various amplitudes of swing . It is necessary , therefore , in order to ...
Page
... various types of compasses , the construction of special apparatus for testing purposes , and special investigations . The information thus obtained was util- ized in the preparation of specifications for various types of com- passes ...
... various types of compasses , the construction of special apparatus for testing purposes , and special investigations . The information thus obtained was util- ized in the preparation of specifications for various types of com- passes ...
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