CHAPTER IX. 



REQUISITES FOR DEVELOPMENT. APPARATUS. 

 CHEMICALS. PRICES. SUITABLE PLATES. 

 DEVELOPERS FOR NEGATIVES. FOR LANTERN 

 SLIDES. FOR BROMIDE PAPERS. TIME 

 DEVELOPMENT. 



Many people have the impression that the work 

 of development must be carried on with a miser- 

 able light from a ruby lamp, and consequently 

 inflict upon themselves trials of patience, until a 

 bad headache compels them to stop, or their 

 powers of endurance are exhausted. Never was a 

 greater fallacy. For ordinary plates a lamp may 

 be used giving plenty of yellow light, so that every- 

 thing can be plainly seen and all operations carried 

 on with comfort. Only when using chromatic plates 

 is a red light necessary. Even with this a lamp 

 having a large red glass front, not too deep, will 

 give great relief, for small lamps are an abomina- 

 tion. In cases where a dark room is not available, 

 the work can be done at night in an ordinary 

 bathroom. Gas is the best illuminant, and lamps 

 are sold that will give red, yellow, or white light 

 at pleasure. Failing gas, the next handiest lamp 

 is a candle-lamp. Candles worked by springs are 

 apt to be very provoking. The light sometimes 



