. Optical projection : a treatise on the use of the lantern in exhibition and scientific demonstration. to the bent end of a wire attached fa) the arm,or by a bent wire attached to the end of a tuning-fork, electri-cally driven. By the latter, sharp ripples are readily producedand focussed, and by adjusting the starting point rather toone side (still better in one of the foci of an elliptical trough),interferences may be shown. See also acoustic ripples in Chapter XVII., and by substi-tuting a vessel of mercury for the funnel of the phoneidoscopeshown in fig. 142, its surface occupying the pos
. Optical projection : a treatise on the use of the lantern in exhibition and scientific demonstration. to the bent end of a wire attached fa) the arm,or by a bent wire attached to the end of a tuning-fork, electri-cally driven. By the latter, sharp ripples are readily producedand focussed, and by adjusting the starting point rather toone side (still better in one of the foci of an elliptical trough),interferences may be shown. See also acoustic ripples in Chapter XVII., and by substi-tuting a vessel of mercury for the funnel of the phoneidoscopeshown in fig. 142, its surface occupying the position of thesoap-film when the funnel is in place, beautiful ripples maybe projected by touching the surface with the point of a wirevibrated as just described, 117. Capillarity.—Capillary attraction is projected by dip-ping small tubes of different bores, fixed in a slip of wood, as DEMONSTRATIONS IN PHYSICS 22* fig. 109, or two small glass plates inclined together and alsofitted at the top in a strip of wood (fig. 110), in a small tank ofwater placed on the lantern stage. The tank may be of any. Fig. 109 convenient shape, and the simple form shown in fig. Ill,where the glass plates are mounted in a wooden frame to fitthe usual slide-stage, will answer perfectly well. The reverse
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Keywords: ., bookauthorwrightle, bookcentury1900, bookdecade1900, bookyear1906
