An elementary book on electricity and magnetism and their applications (1919)
Jackson, Dugald C. (Dugald Caleb), 1865-1951, Jackson, John Price, b. 1868, Black, Newton Henry, b. 1874 · New York, The Macmillian Co · leaf 161
the geographicalmeridian. It will alsobe noticed that the com-pass bowl (Fig. 82) issupported on gimbalbearings, so that, no mat-ter how much the shipmay pitch and roll, thecard will always be level.The navigator not only has to take account of the earthsmagnetic variations but also of disturbances… … Fig. 82. Ships compass bowl mounted ongimbals. SUMMARY OF CHAPTER V Dr. Gilbert in 1600 published the famous book De Magnetedescribing a great many discoveries about magnets. ALL MAGNETS have three properties : (1) Attraction for steel and iron; (2) Pointing in a nearly north and south direction;…
Electricity · Magnetism
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