.I.V ELHCTRICIL rKriQUF.NCy ANALYZER .105 



nKS( RIPTION 



Tlu' im-cliaiiism of llic analy/cr is sd tlcsiniU'il that to take a ri-cord 

 it is only necessary, after starlinj; tlie ainplit'ier and connecting to 

 a 1 10-volt power source, to attach the leads from ihesource or sources 

 to be analyzed and press a starting button. The completed record 

 is then automatically delivered in about ,t minutes after which the 

 apparatus returns to the starting condition rc.uh- to repeat tiic 



Fig. 3 — .Arrangement of Pneumatic and Electrical .Apparatus 



operation. This is accomplished by means of pneumatic apparatus 

 operating in conjunction with a photographic recording device. 



The pneumatic arrangement is a modification of a piano player 

 mechanism in which a paper roll of standard dimensions is used. 

 By proper perforation of the roll special pneumatic relays are operated 

 in proper sequence to switch the condensers of the tuned circuit, 

 flash frequency lines on the record, stop the mechanism after a record 

 has been completed, rewind the piano roll, and perform other func- 

 tions necessar\' to leave the analyzer in the starting condition. Elec- 

 trical relays for switching the tuning condensers were not foimd prac- 

 ticable on account of the disturbances induced into the analyzer circuit. 



The photographic recording apparatus consists of the camera 

 motor for mo\ing the sensitized record paper at a constant rate 

 proper arrangement of lenses and lamps for illuminating the mirror 



