Bauhaus-Universität Weimar

Titel:
Optic Projection: Principles, Installation and Use of the Magic Lantern, Projection Microscope, Reflecting Lantern, Moving Picture Machine
Person:
Gage, Henry Simon and Henry Phelps Gage
PURL:
https://digitalesammlungen.uni-weimar.de/viewer/image/lit39438/76/
CHAPTER IL 
THE MAGIC LANTERN WITH AN ALTERNATING 
CURRENT ARC LAMP AND ITS USE 
§ 100. Apparatus and Material for Chapter H: 
Suitable room with screen (Ch. XII) ; Magic lantern with lan¬ 
tern table (§ 102) ; Arc lamp for alternating current with suitable 
carbons (§ 108); Alternating current supply; Rheostat, choke-coil 
or other balancing device (§ 105-106); Ammeter for alternating 
current (§ 111) ; Incandescent lamp, flash-light, gloves with asbes¬ 
tos patches, testing lamp, fuses, extra condenser lenses, screw 
driver, pliers, opera-glasses, lantern slides as in Ch. I (§ 1). 
§ 101. For the historical development of the alternating cur¬ 
rent arc lamp see the Appendix; and for the character and advan¬ 
tages and disadvantages of alternating current see § 652-653, and 
modem works on the subject. 
The same books of reference given in § 2, Ch. I, are available for 
this chapter. 
Comparison of Alternating and Direct Electric 
Currents and Lanterns 
§ 102. A magic lantern for alternating current may be pre¬ 
cisely like one for direct current, the only essential difference being 
that the arc lamp must be of the hand-feed type and the mechanism 
for feeding the carbons gives equal movement to the upper and to 
the lower one, both carbons being of the same size. 
One would never use an alternating current with the magic 
lantern if direct current were available. It frequently happens, 
however, that the lighting system of a place is of the alternating 
current type, and no direct current is available. In such a case 
one must make the best of it, or use a motor-generator set or a 
rectifier (see § 682-683). 
The objections to an alternating current for the arc lamp in 
projection are: (1) The lamp is noisy; (2) It requires about two 
and one-half times as much current for the same effective light. 
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