Merchant, F. W. (Francis Walter), 1855-1937, Chant, Clarence Augustus, 1865-1956 · Toronto : Copp Clark · leaf 378
g the path of the light. The use of prisms was devised by Porro about GO years ago, buton account of ditficulties in their manufacture they did not comeinto use until quite recently. In the form shown in Fig. 439, that made by Zeiss, a furtheradvantage is in the enhanced stereoscopic power. It will… … CHAPTER XLIMagnetism 422. Natural Magnets. In various countries there is foundan ore of iron which possesses the renuirkable power ofattracting small bits of iron. Specimens ofthis ore are known as natural magnets.This name is derived from Magnesia, a townof Lydia, Asia Minor, in the vicinity of…
Physics
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