Spherolite street lamps used the NEMA "latch-on" system. The most prevalent style refractor was made for pole mounting and had slightly different beading on the "street side" as compared with the "house side" in order to direct more light towards the street.
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Profile of luminaire head.
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This particular unit had a side mount with a photo control socket on the top. The socket could be rotated by loosening two screws so that the photo control faced north. A "N" indicator on the photo control socket bezel allowed for adjustments before the control was plugged in.
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Photo control socket.
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The socket used for photo control units had connections in the back for the photo control. The main wiring lugs provided power to the control and neutral to both the control and lamp socket. An additional lug could be installed that provided a photo control switched output for a second lamp, illuminated sign or other similar purposes.
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Internal view.
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