. The book of photography; practical, theoretical and applied. Fig 324.—Rays Reflected Approximately Parallel improvement. The reason for preferring alarge flame is that the larger tbe sourceof light, in proportion to the negative, thesofter will be the effects. This refers moreparticularly to vignetting, and to such cases where dodging has to be doneon the back. Electric Light. Certainly the most convenient light isthe electric incandescent, which has no. Fig. 325.—Construction of Photometer. objectionable products of combustion, isreadily fixed in any position, and is soeasily turned on and
. The book of photography; practical, theoretical and applied. Fig 324.—Rays Reflected Approximately Parallel improvement. The reason for preferring alarge flame is that the larger tbe sourceof light, in proportion to the negative, thesofter will be the effects. This refers moreparticularly to vignetting, and to such cases where dodging has to be doneon the back. Electric Light. Certainly the most convenient light isthe electric incandescent, which has no. Fig. 325.—Construction of Photometer. objectionable products of combustion, isreadily fixed in any position, and is soeasily turned on and off. Either an eightor a sixteen candle power lamp is colour of the light is not of so muchimportance, as this merely affects thelength of exposure. Daylight is seldom used nowadays for this work,being far too brilliant. It is, how-ever, sometimes employed for the slowerchloride papers and for what are nowcalled gas light papers; but even forthese, artificial light, being more con-stant, is certainly preferable. Whicheverilluminant is chosen, the first thing to do isto form some rough estimate of its power,which is usually spoken of as so many candies.
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