Elementary lessons in electricity and magnetism (1906)
Thompson, Silvanus P. (Silvanus Phillips), 1851-1916, Schwetzky, Otto H. L. [from old catalog] · Chicago, Thompson & Thomas · leaf 128
the ** tangent of theangle O C P. It is clear that smaller angleswill have smaller tangents, but that largerangles may have very large tangents; infact, the length of the tangent when PC wasmoved round to a right angle would beinfinitely great. It can be shown that theratio between the lengths of… … Fig. 63. for the tangent may be written ; tan ^ - ^ = jjj^. 133. Solid Angles.—\Vhen three or more surfaces intersectat a point they form a solid angle: there is a solid angle, forexample, at the top of a pyramid, or of a cone, and one at everycorner of a diamond that hasbeen cut. If a surface of…
Electricity · Magnetism
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