IEEE Power & Energy Magazine - January/February 2017 - 73
in Daly's Theatre (demolished in 1920),
which was located at 29th street and
Broadway in Manhattan in 1888. aC
power was being supplied to that
a rea by the United Electr ic Light
a nd Power Compa ny ( U EL&P) in
competition with the dc power being supplied by the Edison Company.
UEL&P attempted to install reactors
with movable iron cores, to vary the
reactance, as stage lighting dimmers.
However, the design of these devices
left a lot to be desired, and it was found
that, in operation, they "hummed like
a hive of angry bees." That, of course,
was completely unacceptable for theatrical use, and Daly told the UEL&P
wiring men to just "throw the whole
thing out into the street." so ended
that experiment.
The lamp-dimming reactors used
by Hub Electric for the Roxy Theatre
board were series connected as well,
but they were not just simple reactance
coils. These devices were known as
figure 1. The Hub Electric Company stage lighting dimmer board being delivered to the Roxy theater. (Photo courtesy of the Theatre Historical Society of
America.)
saturable core reactors, and they included a second control winding
through which dc was circulated. The
dc served to saturate the magnetic core
of the reactor to reduce its reactance,
in contrast to the earlier attempt to reduce reactance by means of a movable
core. These reactors had been supplied
to Hub Electric by the Ward Leonard
Electric Company.
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