The drawing on page 97 shows in plain view
the essential features of the control boards.
[Sidenote: _The
Instrument
Board_]
A front view of the Instrument Board is shown on page 97. This
board contains all indicating instruments for alternators and feeders.
It also carries standardizing instruments and a clock. In the
illustration the alternator panels are shown at the left and the
feeder panels at the right. For the alternator panels, instruments of
the vertical edgewise type are used. Each vertical row comprises the
measuring instruments for an alternator. Beginning at the top and
enumerating them in order these instruments are: Three ammeters, one
for each phase, a volumeter, an indicating wattmeter, a power factor
indicator and a field ammeter. The round dial instrument shown at the
bottom of each row of instruments is a three-phase recording
wattmeter.
A panel located near the center of the board between alternator panels
and feeder panels carries standard instruments used for convenient
calibration of the alternator and feeder instruments. Provision is
made on the back of the board for convenient connection of the
standard instruments in series with the instruments to be compared.
The panel which carries the standard instruments also carries ammeters
used to measure current to auxiliary circuits in the power house.
For the feeder board, instruments of the round dial pattern are used,
and for each feeder a single instrument is provided, viz.
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