Bauhaus-Universität Weimar

Optic Projection: Principles, Installation and Use of the Magic Lantern, Projection Microscope, Reflecting Lantern, Moving Picture Machine
Gage, Henry Simon and Henry Phelps Gage
ICh. Ill 
Fig. 47. The Magic Lantern with][a Three-Lens Condenser and a 
Water-Cell for Use on the House Lighting System. 
This is the same as fig. 46 except that no[double-pole knife switch is used, and 
there is a triple-lens condenser and water-cell in place of a double-lens condenser. 
It is well also, when one has the lamp properly connected, to turn 
off the current by opening the separable plug, and then paint the 
positive wire red where it is inserted into the binding post for the 
upper carbon. The negative wire can be painted black also. If 
Fig. 48. Wall Receptacles with Separable Cap. 
{Cuts loaned by H. Hubbell, Inc.). 
A Wall receptacle with the connecting prongs polarized so that the cap 
can be put on only one way, thus avoiding change of polarity with direct cur¬ 
B Wall receptacle in which the cap can be put in place either way around. 
Either form can be used with both direct and alternating current.


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