. Light energy, its physics, physiological action and therapeutic applications . movable and bymeans of an adjustable spring is maintained at a proper dis-tance to form the arc. By a suitable resistance in series thelamp may be attached to any outlet with a commercial 110-volt direct-current circuit. The fuse wire connected to the outlet on the wall shouldbe capable of carrying at least 6 amperes. The conductingcords with the rheostat in series are furnished at one endwith an attaching plug and at the other with sockets forconnecting the lamp. The cord should be insulated withasbestos, and not
. Light energy, its physics, physiological action and therapeutic applications . movable and bymeans of an adjustable spring is maintained at a proper dis-tance to form the arc. By a suitable resistance in series thelamp may be attached to any outlet with a commercial 110-volt direct-current circuit. The fuse wire connected to the outlet on the wall shouldbe capable of carrying at least 6 amperes. The conductingcords with the rheostat in series are furnished at one endwith an attaching plug and at the other with sockets forconnecting the lamp. The cord should be insulated withasbestos, and not with rubber or guttapercha. When the Archives dfilectricite Medical, March 15, 1902. CONCENTRATED ELECTRIC ARC LIGHT ENERGY. 487 lamp is to be used it should first be connected with the cords,and the cords afterward connected with the desired partof the house service. The current should then be turned onat the socket. To produce the arc,—the push button on thehandle is moved forward until the terminals are in contact,and then brought gently back to permit the arc to The arc may be broken at any moment by simply blowing itout, as one would blow out a candle, and this should alwaysbe done before turning off the current at the wall tube that projects from the front of the lamp carriesa quartz plate and is left open on the sides purposely to per-mit a free circulation of air. The lamp may be furnished inaddition with a quartz lens which, mounted in a suitableadapter, will furnish it with either parallel or converging 488 LIGHT ENERGY. rays. The strong chemically active light escaping from thesides of the tube naturally impinges on and affects the neigh-boring parts unless they are properly protected. This mayreadily be accomplished by means of shields of non-actinicpaper. These should be about 3! inches in diameter with acentral aperture of 1^ inches. They may be slipped over thetube before it is attached to the front of the lamp. Shouldthe skin lesion be quite
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