. The book of photography; practical, theoretical and applied. Fig. 371-—Dark-room LampFOK Gas. Fis. i2.—Electric Dark-KOOM Lamp. Fig. 73.—BichromateLamp. steady and constant light. This point isoften overlooked, with the result thatnothing but a glimmering light can beobtained. A very suitable form of gaslamp is shown by Fig. 371. This, it will benoticed, is provided with a by-pass burnerat the top, so that the operator may obtaina white light whenever it is required with-out opening the lamp. When gas is theilluminant employed, extra attention mustbe paid to the ventilating arrangements,an a
. The book of photography; practical, theoretical and applied. Fig. 371-—Dark-room LampFOK Gas. Fis. i2.—Electric Dark-KOOM Lamp. Fig. 73.—BichromateLamp. steady and constant light. This point isoften overlooked, with the result thatnothing but a glimmering light can beobtained. A very suitable form of gaslamp is shown by Fig. 371. This, it will benoticed, is provided with a by-pass burnerat the top, so that the operator may obtaina white light whenever it is required with-out opening the lamp. When gas is theilluminant employed, extra attention mustbe paid to the ventilating arrangements,an additional ventilator or flue over thelamp being desirable. Electric Lamps. In spite of the drawback that the exactamount of light cannot be regulated,electricity is a great favourite with many curable, one of these being illustrated byFig. 372. Bichromate Lamps. Many workers prefer to use, in place ofa lamp fitted with ruby or orange glass, aglass cell filled with a solution of potassiumbichromate. This is perfectly safe towork with, and allows a large
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