AUXILIARY APPARATUS 



417 



to it, and supplying many feeders, the size of a meter is of 

 prime importance. There may be on one switchboard 

 a hundred or more meters and it is evident that if these 



FIG. 272. A Round-type Switchboard Ammeter. General Electric Co. 



meters are not comparatively small, the switchboard must 

 be very large and so difficult for one operator to manage. 

 Also the expense for bus-bars, marble, copper feeders, etc., 

 makes it advisable to keep the 

 size of a switchboard as small 

 as possible. 



A round type of switch- 

 board instrument is shown 

 in Fig. 272 and in Fig. 273 

 is shown an edgewise type, 

 having the scale horizontal. 

 It will be noticed that the 

 design of the meter has been 

 carried out with the idea of 

 getting compactness and still 



having a large, easily read, scale. The relative advantages 

 of the round type and the edgewise types are much in 

 discussion; which is the better seems to be an open question. 



FIG. 273. A Horizontal Edge- 

 wise Type Switchboard Meter. 

 General Electric Co. 



