. The book of photography; practical, theoretical and applied. Fig. 605.—CoMiuxEn Heau-Screex and Keflectors. is certainly that which depends onelectricity, either arc or incandescent. Itis questionable which is to be preferred ;the former is the most powerful and moregenerally employed, but many workersmaintain that the incandescent system,properly used, will give softer and betterresults. A good deal depends upon thecurrent available, and the whole subjectis one for consideration not only from a POJITIIAITURE. 475 photographic point of view, but in thelight of advice from a practical electri
. The book of photography; practical, theoretical and applied. Fig. 605.—CoMiuxEn Heau-Screex and Keflectors. is certainly that which depends onelectricity, either arc or incandescent. Itis questionable which is to be preferred ;the former is the most powerful and moregenerally employed, but many workersmaintain that the incandescent system,properly used, will give softer and betterresults. A good deal depends upon thecurrent available, and the whole subjectis one for consideration not only from a POJITIIAITURE. 475 photographic point of view, but in thelight of advice from a practical good ariangement of the arc light forstudio use is shown by Fig. 606; themethod of swinging the concave reflectorto any angle, and the counterpoise whichbalances the arrangement at the desiredheight, will be noticed. Another excellentform is shown by Fig. 607. At A (Fig. 608)is seen a. rackwork contrivance whichadjusts the angle of the reflector. Thefficiency of the arc light depends on thcorrect adjustment of the carbons, and. Studio Arc Lamp. little practice is required in this the incandescent form of studio lamp alarge number of bulbs are enclosed in aconcave reflector, the light being softenedand diffused by means of a screen ofmuslin or other translucent materialfastened in front. Incandescent Gas. The incandescent gas light may be suc-cessfully employed for portraiture, forwhich purpose a sufficient number ofburners are fixed in rows within a largewhite reflector. Suitable fittings are ob-tainable, or can readily be made with acertain amount of contrivance. The light-ing is satisfactory as regards softnessand modelling, but a considerable amount of heat is evolved, and, unless a largenumber of burners are used, the exposureis rather long. Attention should be givento securing a sufficient pressure of gas. Magnesium Flashlight. The powerful and peculiarly actinic lightevolved during the burning of magnesium
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectphotography, bookyear
