IEEE Power & Energy Magazine - January/February 2017 - 75

2-3FC-IEEE-Optimisation-118x254mm.pdf 1 22/11/2016 5:32:47 PM

that time for theaters such as the Roxy
to have more than one service in the
event of the failure of one while an audience was in the building. Having power
supplied by two different companies
further increased the reliability of service in emergencies.
DC was required for the control windings of the saturable core reactors used
in conjunction with the Hub control board.
However, dc was also needed for the operation of arc lights, both in movie projectors and for large follow spots from
the balconies. aC arc lights were available, but they tended to hum, just as the
reactors did in Daly's Theatre.
There were a total of 200 dimmers
controllable from the Hub board. The majority of these were saturable core reactors
having capacities of up to 15 kW each.
Resistance dimmers for such large loads
would have been horribly energy wasteful,
and their physical size would have made
them ponderous as well. some of the levers on the board did control resistance
dimmers for smaller, specialized lighting
loads up to 2,000 W. These probably operated on ac as well since they were supplying incandescent lighting loads.
Interestingly, the use of archaic resistance dimmers continued for a very
long time during the 20th century in
the lighting of major Broadway shows
because the old Broadway theaters
were still supplied with dc, and the theater owners were not inclined to pay for
new ac services. as a result, resistance
dimmers were the only devices that
could be used to control the stage
lighting. This situation did not begin
to change until public demand forced
the owners to provide air-conditioning
following the inclusion of such in the
new theaters at Lincoln Center built during the early 1960s.
Consolidated Edison's main dc supply facility for the Times square area
was the West 39th street rotary converter substation, and it was not able to
be retired until 1977.

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Table of Contents for the Digital Edition of IEEE Power & Energy Magazine - January/February 2017

IEEE Power & Energy Magazine - January/February 2017 - Cover1
IEEE Power & Energy Magazine - January/February 2017 - Cover2
IEEE Power & Energy Magazine - January/February 2017 - 1
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IEEE Power & Energy Magazine - January/February 2017 - 92
IEEE Power & Energy Magazine - January/February 2017 - Cover3
IEEE Power & Energy Magazine - January/February 2017 - Cover4
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