CH. I] 



SOME AMERICAN MAGIC LANTERNS 



59 



98. If the lantern table is on a concrete floor which is damp 

 the operator is liable to get a shock unless he stands on a mat or 

 board or other insulating material, provided some part of the cir- 

 cuit is grounded (see 689). 



SOME EXAMPLES OF AMERICAN MAGIC LANTERNS FOR THE DIRECT 

 CURRENT ARC LAMP 



99. The following examples of American Magic Lanterns are 

 introduced to give the reader some notion of the lanterns on the 

 market which can be obtained at any time and at a very moderate 

 cost. 



In subsequent chapters will be found pictures of lanterns for 

 the different forms of radiants, and for two or more kinds of 

 projection (combination apparatus). 



In the appendix at the end of the book will be found the addresses 

 of some of the great manufacturers in all countries with the prices 

 for the different complete outfits for the various forms of projection. 



FIG. 32. MAGIC LANTERN IN OUTLINE TO SHOW THE PARTS. 

 (Cut loaned by Williams, Brown & Earle). 



At the left, the side of the lamp-house is removed to show the hand-feed, 

 right-angled arc lamp with the supply-wires and the carbons in position. 



C D The condenser composed of two plano-convex lenses. In the space 

 (0) a water-cell may be inserted. 



G The oblong opening, just in front of the condenser, into which the slide 

 carrier is inserted. 



A The projection objective fastened to the end piece B, which also holds 

 the bellows. 



E F Set screws serving to fix the apparatus on the guide rods. 



