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IransVerteK
For twenty-one years has been serving faithfully the Motion Picture Industry ... in providing uniform voltage.
We pledge to you the same faithful service in the future as in the past . . . anticipating and fulfilling every projection room requirement with the utmost efficiency.
Available through The National Theatre Supply Co.
Manufactured by
THE HERTNER ELECTRIC COMPANY
12690 ELMWOOD AVENUE CLEVELAND, OHIO
81%
MORE LIGHT With
a
nd 1 0i Reflecto
r s
Working them in combination with SRA carbons gives the kind of light that makes pictures actually live. That's what people pay to see. That's how you make money by adopting this marvelous combination. Actually 81% more light — nearly double the brilliance — -from an investment that is ridiculously small.
Tests Made Under Working Conditions
In an average, every-day theatre such as you will find by walking along any principal street, we got results that are certain to boost box office. With ordinary equipment we produced 8 foot candles on the screen. We got 14J/2 foot candles when we switched over to the Kni-Tron hooked up with SRA carbons in front of a 10%" reflector: 11% as against 8, an increase of 81%. All other conditions were unchanged.
You can do the same. When customers see brilliant, clear, razor-sharp pictures they come back oftener. Soon you have the small cost back and the bigger profits follow. Write for details now.
THE KNEISLEY
3852 Watson Avenue
ELECTRIC
COMPANY
Toledo, Ohio
Designed to Compel Attention
to announcements in lobbies, windows and salesrooms. THE NEW "BEST" AUTOMATIC SLIDE PROJECTOR Revolving slide carrier accommodates ten slides, projecting each one 10 to 30 seconds as desired. Just plug in lighting circuit. Compact (12" x 14" x 24") ; light (14 lbs.): efficient
ventilation; projection
26
SUPER-LITE LENSES
and
PRO-JEX SOUND UNITS
are giving universal satisfaction
A TRYOUT WILL CONVINCE YOU
Projection Optics Co., Inc.
330 Lyell Ave., Rochester, N. Y., U. S. A.
projectors close enough to each other so that the pictures will coincide on the screen without keystone or distortion, and the reversal of the picture so that the titles read correctly from the auditorium.
This latter feature eliminates the necessity of reversing the soundheads of the projectors and permits the use of standard projectors and soundheads and the threading of the film in the normal way. This prism is unsilvered so that the loss of light is, theoretically, not over 10%. It is placed between the other units of the lens.
The second unit consists of what might be considered an ordinary positive projection lens, except that it will not project a satisfactory picture when used alone and is intentionally calculated that way in order to produce the required result in conjunction with the other units. It consists of two achromatic positive lenses spaced apart a fixed distance, mounted in a single barrel, and having a focal length of approximately 3 inches.
The third unit consists of two negative lenses, one of them achromatic, spaced apart a fixed distance, which is relatively small, and forming a negative combination. When the negative unit is placed in front of the positive unit, the beam of light is suddenly spread out, forming the picture at a distance less than one-third the distance required by the positive unit above.
View of a Trans-Lux projection room.
Better Theatres