Light; a course of experimental optics, chiefly with the lantern . Fig. 95.—Film of Oxide. neath the centre (Fig. 95). Bring down the light from thelantern, and focus, as in Fig. 26, then light the lamp. Asthe film of transparent oxide forms on the steel, colourappears, which gradually takes the rough shape of variously F13. ACE FG HewtoTLS Births B SpeatrvTn. o-f Ditbo. Soap IHlm^ D SpeutT^Lcm, of DjAto . Speotnvm, afJn^hb -refleatedy fharrv -Kbru O-F Mtoih ?Diflfheujtion Spectrcb of sbub ,-Oiroii^h O/ NoberOs yratin^.Ditto obseTnreR. thr^oiuih^ Prijvm^ _ rx.] SOAP FILMS. i5i c
Light; a course of experimental optics, chiefly with the lantern . Fig. 95.—Film of Oxide. neath the centre (Fig. 95). Bring down the light from thelantern, and focus, as in Fig. 26, then light the lamp. Asthe film of transparent oxide forms on the steel, colourappears, which gradually takes the rough shape of variously F13. ACE FG HewtoTLS Births B SpeatrvTn. o-f Ditbo. Soap IHlm^ D SpeutT^Lcm, of DjAto . Speotnvm, afJn^hb -refleatedy fharrv -Kbru O-F Mtoih ?Diflfheujtion Spectrcb of sbub ,-Oiroii^h O/ NoberOs yratin^.Ditto obseTnreR. thr^oiuih^ Prijvm^ _ rx.] SOAP FILMS. i5i coloured rings, though not very regular. This experimentis a little tedious; but it is a very interesting one. Afterthe lantern and plate are first adjusted, some other experi-ment may he proceeded with while the heat operates; oroxidation may be hastened by covering the hot plate witha film of solid paraffin, which will easily spread and greatlyhasten the process. g8. Soap Films.—Soap films, however, offer the mostsplendid phenomena. A good solution is of great importance,and there are many recipes, the most generally known beingPlateaus. For_this dissolve i ounce oleate of soda {6d. perounce), cut into thin slices, in two pints (40 ounces) distilledwater, rather hot. Mix the solution with 30 fluid ounces ofpure glycerine, and
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Keywords: ., bookcentury1800, bookdecade1880, bookidcu3192403121, bookyear1882
