Boxoffice-January.08.1955

You can do something about the matter of
whether theatregoers patronize you or the
theatre down the street.
Don't let old fashioned equipment steal your
profits. What good is a theatre with no audience?
Old equipment just won't do. Theatres with
obsolete equipment cannot compete with those
modernly equipped. You can't fool the public.
even though Barnum is reputed to have so
claimed. Today's requirements demand equipment
that is geared to the times. Things have
happened with projection arc design in
the last
few years. Modern equipment is no relative of
extravagance. It pays, doesn't cost. We're sure
you'll junk your old projection arc lamps when
you see the
OUECTION ARC LAMP
... the lamp that is
readily adaptable to all types of modern screen presentation.
National's Reflect-0-Heat unit permits the
great increase in volume of light at the
mammoth new screens, without a corresponding
increase in heat at the aperture.
The Automatic Crater Positioning
Control
System insures that both carbons are so fed
as to maintain a correct arc gap length and
to keep the position of the positive crater at
the exact focal point of the reflector.
Thus,
throughout the presentation, the screen light
is always of the same color, without variations
from white to either blue or brown.
The projectionist is accordingly freed from
the necessity of constantly supervising the
arc so that he can devote himself to the care
ITIONAL
EATRE SUPPLY
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of other technical features of projection
which are not on an automatic basis and
which require continual attention.
The arc is stabilized by a stream of air
which maintains a prescribed system of ventilation
of the area surrounding the arc. This
air jet prevents the hot tail flame of the arc
from reaching the reflector,
supplies enough
oxygen so that no black soot is produced,
and keeps white soot from collecting on the
reflector in such quantity as to absorb heat
which would cause breakage.
Unit construction
permits easy removal of
the elements for inspection in servicing.
luary 8, 1955 13