Frost: AUXANOMETER AND CONTINUOUS RECORDER. 185 



by the distance between the two successive forward movements 

 of the pen, or, what is the same thing, the length of the line 

 traced while the circuit is closed, plus the length of the line 

 made while the circuit is open, as any one notch passes the 

 ratchet. 



The auxanometer is connected with the registering appa- 

 ratus and an electric battery. The battery is of a type suited 

 for a closed circuit. The two instruments may be placed upon 

 the same table, or they may be separated any distance, as 

 is most convenient for the operator. 



This recorder may also be used with many other kinds of 

 apparatus wherever a continuous record is desired. 



See Plate IX. 



