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October, 1929
The INTERNATIONAL PHOTOdRAPHF.R
Nineteen
Whistle "Boxes
-BY
EARL MILLER, Chief Electrician Paramount-Famous-Lasky
Quieting Arcs for Studio Sound Lighting
./ "Whistle Box" is so-called because it
doesn't whistle. On
/he other hand it
takes the "whistle"
out of the are lamp.
It came in with the
sound picture and
is a clever de-vice
to silence the
carbon
light.
~*/ounct >n two sections Connected Parallel. W, re JDC C Jo. Turns fQ8 pg. Section Cere msu'at ,.*n '/it, 8l«Fibe
Buili of *I6 81 K Iron W,re
PLAfJ B-B
B
X3
0 0 CO o o
0 0 o o o 0
0 o o o o o
0 0 O 0 0 o
IievA ti on ■ Sec TION
60-SXBEJC3
Layout of Choking Coil
j Wn.n/e Bo<s
Earl Miller, whose "by I i n e" adorns this page, is one of the cleverest electrical engineers in the mo/ion picture industry. II e n e e forth, his n a m e will appear more frequently in this publication.
Sound brought to the electrical department may problems in rebuilding and readjusting equipment to make it run in perfect silence. We were faced with the possibility of being forced to scrap several hundred thousands of dollars worth of serviceable and very necessary arc lighting equipment.
We started by trying to change to fibre gears in the high intensity lamps but discovered that by the simple expedient of
putting on a cutout switch that would stop the feeding motors we could stop all mechanical sounds during actual shooting and still maintain uniform light. Commutator ripple offered a problem that was not so easily overcome. Several different methods of building balanced filter circuits were tried but the iron cored choke coil offered the most practical means of quickly solving the problem. It seemed at first that the extra
weight would make it expensive to handle but the accompanying photographs show that it is now made very compact. They can be stacked at the switchboard and thereby eliminate the necessity of moving them with the individual lamps. We are now working on a set covering an entire stage. It is being photographed in all color and is all sound and all arc lighting. We are using 58 Sun Arcs, 90 Scoops and 25 Rotary Spotlights.