the heads of the audience. A low table which
requires excessive extension of the elevating legs
should not be used as this will produce a distorted
screen image—it will be impossible to focus
sharply. With the opaque projector, the screen
illumination obtained is not great, and it is
necessary to use a dark room for satisfactory
projection.
Lantern-Slide Projector
The lantern-slide projector is specifically
designed for auditorium and theater projection of
standard 3-1/4 by 4-inch lantern slides, 2-3/4 by 2-
3/4 inch slides, and 2- by 2-inch slides. Some
models of this type of projector have built-in optical
pointers. The projector uses a 750-watt lamp, is
blower cooled, and has an extremely wide range of
objective lenses available. Figure 7-10 shows the
standard lantern-slide projector.
Slide Projector
The Carousel projector (figure 7-11) is
representative of the various types of slide pro-
jectors in use. This projector accepts any slide
mount whether it is glass, cardboard, metal, or
plastic as long as the outside dimensions do not
exceed 2 inches by 2 inches (50 mm x 50 mm).
The standard slide tray furnished with the
142.123
Figure 7-10.—Lantern-slide projector.
142.340
Figure 7-11.—Carousel slide projector.
projector accepts 80 slides with mounts up to one-
tenth of an inch (2.5-mm) thickness and the
optional universal slide tray accepts slides up to
one-eighth of an inch (3-mm) thickness. Slide
identification numbers are molded on the tray. A
locking ring fits on top of the tray to keep the slides
from spilling if the tray is inverted. The carrying
case provides a means of carrying and storing the
projector. This case also has two compartments
that carry a slide tray, extension cords, lenses, and
other miscellaneous equipment.
DESCRIPTION.—The Carousel projector is
designed to ensure jamproof operation. When a
7-21
