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 126
times the length of the diameter, or more exactly 3I4IS9 This number is so awkward that, for convenience, we always … CHAP. II.] ELECTRICITY AND MAGNETISM. 109 Hse for it tlie Greek letter tt. Hence the length of the circum-ference of our circle, whose radius is one centimetre, will be6283i8 . . . centimetres, or 27r centimetres. We can thenreckon any angle by naming the length of arc that subtends iton a circle…
Electricity · Magnetism
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