THE WORLD'S ADVANCE 



383 



Detail No. 10 shows the rods on which 

 slides the primary. 



Detail No. 1 1 is the hard rubber bush- 

 ing for the secondary switch. 



Detail No. 12 is the hard rubber base 

 for the binding posts. 



Detail No. 13 presents the tops and 

 bottoms of the adjustable condensers. If 

 adjustable condensers are already at 



ner from which the movable plate is cut. 



Detail No. 16 shows the separating 

 washers for the condensers. 



Detail No. 17 indicates the rods for the 

 washers. The length of these rods is de- 

 pendent on the thickness of the plat&s 

 used and can be readily estimated once 

 the plate stock is at hand. 



Detail No. 18 is the switch lever for 



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fiy. 6. 



Details of the Case for the Inductive Tuner. It is 'Best to Use Mahogany or Oak, although a Good Grade 



of White wood can be Substituted. 



hand these pieces need not be made, as 

 the condensers can be mounted in place 

 of them. Any adjustable condenser of 

 large capacity will do. 



Details Nos. 14 and 15 are the station- 

 ary and movable plates of the condenser, 

 respectively, and demonstrate a method 

 of cutting both plates from one square 

 piece of plate. The diagonal lines are, 

 of course, first cut, thus releasing the cor- 



the secondary of the receiving trans- 

 former. 



Detail No. 19 shows the fixed tuner 

 switch lever. One end of one of these 

 levers should cut to a point to act as a 

 pointer. 



Detail No. 20 is of the knurled adjust- 

 ing disc which is to be screwed to the 

 center of one of the switch arms shown 

 in Detail IsTo. 19. 



