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
t 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 anygiven shape be near a point, itis said to subtend a certain solidangle at that point, the solidangle being mapped out… … Fig. 64. solid angle we adopt an expedient similar to that adopted whenwe wished to reckon a plane angle in radians. About the pointP, with radius of l centimetre, describe a sphere^ which willintercept the cone over an area j\I N : the area thus interceptedmeasures the solid anisic If the sphere…
Electricity · Magnetism
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![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-356-247.webp)
