. American hydroelectric practice; a compilation of useful data and information on the design, construction and operation of hydroelectric systems, from the penstocks to distribution lines . ?n saKPJi j^oo^. Whenever an emergency source, such and back of a switchboard shouldbe well illuminated. In mostcases the general illuminationwill take care of this and nospecial lighting will be special switchboardlighting must be installed, atrough reflector held at a properdistance from the switchboardshould be used with either JohnsManville Linolite lightingunits and reflectors or sta
. American hydroelectric practice; a compilation of useful data and information on the design, construction and operation of hydroelectric systems, from the penstocks to distribution lines . ?n saKPJi j^oo^. Whenever an emergency source, such and back of a switchboard shouldbe well illuminated. In mostcases the general illuminationwill take care of this and nospecial lighting will be special switchboardlighting must be installed, atrough reflector held at a properdistance from the switchboardshould be used with either JohnsManville Linolite lightingunits and reflectors or standard10-watt tungsten units with suit-able reflectors. An easy methodof supporting the shade withoutgiving it a clumsy appearance isshown in Fig. 103a. The switch-board pipe supports are extendedup and the shade is bracket sup-ported therefrom. A small holein one of the pipes will let thewires pass into the shade. Ingeneral the problem of switch-board illumination is about thesame as that of lighting paint-ings in art galleries, with the onlydifference that a painting re-quires the same amount of lightover its whole height, while aswitchboard requires more lightat its upper part where the in-strument
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyorkmcgrawhillb
