To avoid mercury vapor lamp failure,
white gloves should be worn when
handling the glass portion of the
Light Table. The light table is a Foster Model 36
G/S and is used to prepare copy from which the lithographic
printing plates are made. The preparation includes layout of
the copy and retouching, opaquing, masking and stripping.
The unit is shock mounted to a shelf attached to the left-hand
shelter wall. A rotating type stool is provided for the operator
and is secured when not in use immediately below the shelf.
The electric power cord of the unit is inserted into a
convenient wall receptacle above the shelf. A two position
toggle switch installed on the front of the light table controls
illumination of the fluorescent tubes within the unit.
Composing Machine. The type composing machine
is a Varityper Model 1010F and is used in the preparation of
master copy for reproduction. The composer which is a cold
type direct impression machine incorporates power control of
Interchangeable type faces provide a variety of point sizes
with a differential spacing capability automatically selecting
correct letter design width. Right-hand margin justification is
achieved automatically through the use of margin stops for
the desired column width. A forms ruling device provides for
ruling of any style of line or leader. The composer is shock
mounted to a stand attached to the front wall of the shelter. A
folding chair is provided
for the operator and is secured when not in use to the left-
hand shelter wall adjacent to the light table shelf. The electric
power cord of the unit is inserted into a convenient wall
receptacle immediately below the wall cabinet.
Camera. The camera is a Goodkin vertical process
18 inch unit equipped with an 8.25 inch focal length wide-
angle color corrected lens. Recalibration of the lens is
accomplished by adjustment of the calibration tapes for the
lens and copyboard. Two vacuum pumps are provided with
the camera. (See fig. 2-2.) The pump to the right of the
camera, controlled by a foot pedal, is connected by means of
a flexible hose to the underside of the copyboard. During
operation this pump provides the vacuum for even contact for
the material to be re produced. The pump to the left of the
camera, controlled by the camera power switch, is connected
by means of a flexible hose to the film case and provides
vacuum for even contact of the film during exposure. Camera
lighting is supplied by four 650 watt quartz lamps located in
two housings, bracket mounted, one on each side of the
copyboard base. A one-piece conical bellows serves as a
light-tight seal between the lens case and the film case.
Camera controls and timer are located in a control panel
installed on top of the equipment. The camera lens is
removed and placed on a bracket in the inverted position
during camera moving.
Never leave lens bellows extended
when the camera is not in use.
Retract bellows so as to maintain
folds in correct position.