ELECTRIC LIGHT.
The most convenient and satisfactory system of artificial lighting for the studio noted as a serious source of additional expense, and, whatever may be main tained to the contrary by its partisans, the results obtained cannot be advan tageously compared with those taken by daylight. For all that, much excellent work is being clone by exponents of the is certainly that which depends on electricity, either arc or incandescent. It is questionable which is to be preferred ; the former is the most powerful and more i generally employed, but many workers maintain that the incandescent system, ' properly used, will give softer and better results. A good deal depends upon the current available, and the whole subject is one for consideration not only from photographic point of view, but in the light of advice from a practical electrician. A good arrangement of the arc light for studio use is shown by Fig. 606 ; the method of swinging the concave reflector to any angle, and the counterpoise which balances the arrangement at the desired height, will be noticed. Another excellent
form is shown by Fig. C07. At A (Fig. Gas) is seen a rackwork contrivance winch adjusts the angle of the reflector. The efficiency of the arc light depends on the correct adjustment of the carbons, and a of heat is evolved, and, unless a large number of burners are used, the exposure is rather long. Attention should be given to securing a sufficient pressure of gas.
MAGNEsmiu FLASHLIGHT.
The powerful and peculiarly actinic light evolved during the burning of magnesium little practice is required in this respect. In the incandescent form of studio lamp a large number of bulbs are enclosed in a concave reflector, the light being softened and diffused by means of a screen of muslin or other translucent material fastened in front.