Merchant, F. W. (Francis Walter), 1855-1937, Chant, Clarence Augustus, 1865-1956 · Toronto : Copp Clark · leaf 323
ig.350 from an in-stantaneous pho-tograph of rippleson the surface ofmercury. Theplane waves wereproduced by apiece of glassfastened to oneprong of a tun-ing - fork. Theymove forward andmeet a concavereflector, by whichthey are changedinto circularwaves converi^ino- to tlie principal ^iq,… … CONJUGATE FOCI—ILLUSTRATIVE EXPERIMENTS 313
Physics
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