A laboratory course in experimental physics (1896)
Loudon, W. J. (William James), McLennan, John Cunningham, joint author · New York and London, Macmillan and Co. · leaf 136
cross-sections are usually parabolas *or lemnis-cates, and in the center is a plane. This seems to arise from the two sets of waves which aretravelling along the string with velocities in the ratio i : 2. Tyndalls experiment with the luminous wire may also beshewn by using an electrically vibrating… … Fig. 2 1. and the brass pulley which gives good contact; the wire beingthen made red hot by a current of io or 15 amperes, the fork isset vibrating; when immediately one sees the loops becomedark, owing to cooling by their rapid motion, and the nodesgrow brighter. More current is then turned on…
Physics
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