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Historical Articles: Spotlight Section
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Section through a spotlight or lens hood, a typical construction diagram of an average spotlight. The solid lines with arrows indicate the typical direction of the rays of light. It will be noted that rays which emanate from the rear of the filament are reflected by a mirror so that they pass through the center of the filament toward the lens.
*clockwise from top left:
(1) Reflector adjustment. Thumb screw.
(2) Spherical mirror.
(3) Sharp focus position
(4) The globular (G-type) glass bulb of the lamp. This type is used exclusively in spotlights.
(5) Concentrated high-power filament burns base down to horizontal.
(6) Ventilating space.
(7) Focal range.
(8) Flood focus position for the filament.
(9) Horizontal color frame slides or grooves.
(10) Vent holes.
(11) Plano-convex lens.
(12) A spring ring used to hold the lens in position.
(13) Color frame clamp or spring.
(14) Base of the lamp.
(15) Socket, mounted in an adjustable lamp carriage which can be moved forward and back to provide focal range.
(16) Focal slot.
(17) Focal handle, by which the position of the lamp in relation to the lens is regulated.
(18) Adjustment screw to raise or lower the socket.
(19) Male pin connector.
(20) Asbestos leads.
(21) Bushing.
(22) Access door, for removing and replacing the lamp and adjusting the reflector.
reproduced from:
A Method Of Lighting The Stage
by Stanley McCandless
Theatre Arts Books
New York, NY
1958
Copyright 2001 VISUAL TERRAIN, INC.
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