420 ELECTRICAL MACHINERY 



Recording Meters. A recording meter is much used in 

 station work. Its moving element carries a pen which 

 draws a curve on a paper strip which is fed under the pen 

 by suitable clock work. A very fine type of recording meter 

 is shown in Fig. 276. The moving element is a kind of mag- 

 netic balance which carries the glass pen back and forth 



FIG. 276. A Recording Meter. Its records serve for checking 

 station efficiency, uniformly of load. etc. Westinghouse Elec. 

 and Mfg. Co. 



over the paper strip as the current through the instrument 

 varies. 



Value and Importance of Records. By inspection of the 

 curve traced by such an instrument the station superin- 

 tendent can tell at a glance just what the load on his station 

 has been, what its maximum and minimum values were and 

 when they occurred. Or, if the record is from a voltmeter, 



