Conditions of sensibility of photo-electric cells with alkali metals and hydrogen . 21 Plate I. Tlie lower curvse wers obtairi«»(l te^oie tli^ cell was formedwhile the uoper cm^-. were obtained vrter rorrniiig;, TheoorreBporiding curves for before and a-^ter forming t^howthat the negative ions have velocities high enough to causeionization by collision n t -ibout the same oltage. hevoltage required for illumination is much Isss beforeforming, Plate IT. All th^.t is said above Tor plate I is true for this plate. The voltage reqiured for illumination is much: greater forthe pressure cf l,C mm. t
Conditions of sensibility of photo-electric cells with alkali metals and hydrogen . 21 Plate I. Tlie lower curvse wers obtairi«»(l te^oie tli^ cell was formedwhile the uoper cm^-. were obtained vrter rorrniiig;, TheoorreBporiding curves for before and a-^ter forming t^howthat the negative ions have velocities high enough to causeionization by collision n t -ibout the same oltage. hevoltage required for illumination is much Isss beforeforming, Plate IT. All th^.t is said above Tor plate I is true for this plate. The voltage reqiured for illumination is much: greater forthe pressure cf l,C mm. than for the other curves. Thesecurv<*3 seem to show that ther^ is niinirnim il lurriinatingvoltage for a certain critical pressure, ^he ^urvt mm. pressure show the best photo-electric conditionfor sensitiveness, Plate curves for different temperatures indicate that thevoltage at which negative ions attain ionizing velocityis least in those for higher temperature. The illumin-ating voltage is much less for higher teii^eratures than for higher t^^mperaturesfor
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttheses, bookyear1912
