172 Prof. J. C. Bose. On the Continuity of [Apr. 18 y 



effects described below may be obtained by much feebler light, such as 

 that given by a paraffin lamp or a candle. The strong similarity to 

















































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Fig. 9. — Electromotive variation in AgBr cell due to the action of light. Ordinate 

 represents E.M. variation, and abscissa the time. Thick lines represent the 

 effect of light and dotted lines the recovery, (a) and (b) represent the effect 

 of flashes of light of 2 seconds duration. The distance of source of light in 

 (a) = 12 inches ; in (b) = 6 inches, (e) and (d) represent the effect of 

 continuous light (duration 30"), distance of source of light in (c) = 18 inches 

 in (d) — 9 inches. 



the curve for single flashes of electric radiation (see fig. 4) will at once 

 be noticed. The recovery curve is also convex to the abscissa. The 

 time allowed for recovery was not sufficient to bring the substance 



