International Library of Technology · Scranton, International Textbook Co. · leaf 106
he box above the table orother surface on which it is placed. The compass should beplaced in the center of the box, with the north and southline of the divisions on its scale in line with the center lineof the box across, that is, the line a b, Fig. 939, and shouldbe fastened there by a drop of… … Fig. 939. the box on the line a b will have its plane in a north andsouth position, parallel to and coinciding with the axis ofmagnetism of the needle, and any deflection of the needlecaused by a current in such a coil may be read directly indegrees on the scale of the instrument. If desired, two…
Electrical engineering
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