Hawkins electrical guide ... : questions, answers & illustrations : a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications ; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833-1928 · New York : T. Audel & Co. · leaf 187
ht red; the longest heat waves, about 1/362of an inch in length have a frequency of about 10 billions per second.In other words the lengths of ether waves produced by natural condi-tions vary inversely with their frequency, that is, the higher the fre-quency the shorter the length of the wave. From… … Fig. 3,110.—Mechanical analogy illustrating tuning. If a stick of timber L be suspendedfrom a rigid support E by a spiral steel spring C, and the timber be given a pushupward, or downward, it will vibrate a certain number of times per minute. If it be pushedgently it will move slowly through a…
Electrical engineering
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