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THE IRIS CONTROL is the front lever which projects through the top of the optical
system housing. When this lever is to the left, looking at the spotlamp from the rear, the largest aperture
is provided. Smaller apertures are obtained as the lever is moved to the right.
THE SPOT SIZE CONTROL HANDLE is located on the right side of the optical system
just above the base pan. A variation of spot sizes from full flood to a small spot can be obtained by
moving the spot size control from one extreme to the other. Beam intensity is increased by this optical
system when reducing from flood to spot and maximum intensity is reached when the spot size control
is in the extreme forward position.
THE MAXIMUM FLOOD SPOT is obtained with the iris control lever to the left (away
from operating side) for the large aperture and with the spot size control handle moved as far as possible
toward the rear.
SMALLER SIZED SPOTS are porjected as the spot size control handle is moved forward.
Most of the spot sizes needed wiill be produced with the iris in its maximum open position.
FOR A "HEAD SPOT," or any spot size smaller than can be obtained with the spot size
control handle in its extreme forward position, shift the iris control lever to the right (toward operating
side) for a smaller aperture. The iris control lever should always be returned to its extreme left position
before the spot size control handle is again moved to obtain larger spots.
THE MASKING SHUTTER LEVER is the middle lever projecting through the top of
the optical system housing. The masking shutter blades are operated by this lever to shape the projected
spot to a rectangle, strip spot, or dousing.
THE DISENGAGED POSITION of the masking shutter lever is to the extreme right
(toward operating side) and varying degrees of masking to complete cutoff are obtained by moving the
lever to the left (away from operating side).
ULTRAVIOLET RADIATION is emitted when the bulb is ignited. Wear
protective clothing and goggles or glasses when adjusting the shutter
blades or performing any service with the optical system housing removed.
OPERATION OF OPTICAL SYSTEM
CAUTION
575/008
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