. Optical projection : a treatise on the use of the lantern in exhibition and scientific demonstration. ass, may bepartially projected in the samesimple manner ; but to showthe actual detachment of aring of oil at a given velocity,the vertical method must beemployed. The manner willsuggest itself, but fig. 11Gshows the apparatus as ar-ranged by Stohrer. The raysfrom the condensers fall at45° upon the reflecting mirror su to be directed upwards. Inthe field is placed the cubical tank g, with a glass bottom p,held by the screw mx. By the screw m3 is adjusted therevolving arrangement, consisting
. Optical projection : a treatise on the use of the lantern in exhibition and scientific demonstration. ass, may bepartially projected in the samesimple manner ; but to showthe actual detachment of aring of oil at a given velocity,the vertical method must beemployed. The manner willsuggest itself, but fig. 11Gshows the apparatus as ar-ranged by Stohrer. The raysfrom the condensers fall at45° upon the reflecting mirror su to be directed upwards. Inthe field is placed the cubical tank g, with a glass bottom p,held by the screw mx. By the screw m3 is adjusted therevolving arrangement, consisting of a perpendicular rotatingwire provided as usual with a small tin disc near the bottomto carry the sphere of oil, and a small pulley to at the top, bywhich this is rotated from the larger pulley w. By the screwmz the whole can be adjusted for height and in the centre ofthe field; and in Stohrers apparatus revolution is effectedby a thread e fastened to the endless cord which embracesboth pulleys, but I myself should prefer a up the pillar v, which is attached to the mirror-box. Tia. 115 DEMONSTRATIONS IN PHYSICS 227 k, is fixed by the screw thering k, which carries the focus-sing objective, bearing at the topanother ring /, carrying the in-clined mirror s2, which reflectsthe image to the 119. Viscosity. — Very im-pressive experiments may be pro-jected with a 2 per cent, solutionof saponine. With care this willblow a bubble nearly 2 inchesdiameter; the best way is to clipa small glass funnel f inch dia-meter mouth downwards in auniversal holder, with a bit ofrubber tube for blowing sprungon the small end ; this is adjusted
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Keywords: ., bookauthorwrightle, bookcentury1900, bookdecade1900, bookyear1906
