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December, 1929
The INTERNATIONAL PHOTOGRAPHER
Thirty-one
Dr. G. Floyd Jackman
DENTIST
Member Local No. 659
706 Hollywood First National Bldg.
Hollywood Blvd. at Highland Ave.
GLadstone 7507 Hours: 9 to 5
And by Appointment
RIES BROS., INC.
PHOTO SUPPLIES
1152 N. Western
GRanite 1185
LEWIS W. PHYSIOC
Special Effects Card Shots
Multiple Exposures
TEC-ART STUDIOS 5360 Melrose Ave. Telephone
Los Angeles GRanite 4141
For professional Bell & Howell and DeBrie cameras. Send full description for cash offer. Or telegraph Bass Camera Company, 179 West Madison street, Chicago, Illinois.
For Sale or Rent
2 B & H Cameras, 2.3 Astro Lenses and Cinemotor Complete
B. B. RAY
401 N. Orange Grove WHitney 400^
MR. BALSLEV WRITES Editor International Photographer.
Dear Sir — I was recently interested in experiments in New York similar to those outlined in J. C. Alberts' paper in the November issue.
We found that the size of the shunt condenser could be greatly reduced and the effectiveness of the filter increased by tuning the series field as shown even though we found the nipple to have a fundamental of 1200 cycles with over fi% second harmonic content.
ROY H. KLAFFKI
The frequency of the ripple is a function of speed and number of commutator bars and the inductance of the series field varies with machines so no values can be accurately tabulated.
They can be adjusted easily at the generator by listening across the line.
First adjust the capacity of the condenser around the series field until the ripple is a minimum and then add the shunt condenser.
In many cases with small generators used to replace batteries on amplifiers the reactance of the series field was raised so high by tuning that 8 mf was sufficient for the shunt condenser.
J. R. BALSLEY
A. P. S. BANQUET The first midnight banquet and ball of the California Chapter, American Projection Society, was given at the Roosevelt Hotel, Tuesday, November 26, President Sidney Burton presiding, ably assisted by Secretary Dave Koskoff and Treasurer Ed. Kellar. One hundred and forty-five guests were in attendance and the occasion was an immense success.
FOR RENT
Complete Mitchell sound equipment— Cable and Clutch.
Phone HE-6230
John Silver
Walter J. Van Rossem
Photographic Laboratory and Camera Rental Service
HOIIy 0725 6049 Hollywood Blvd. Hollywood, California
3ra «. Hoke
now with M. HALL
Assistant Cameraman GLadstone 4203 HEmpstead 1128
Paul P. Perry
with complete
Mitchell Sound Equipment
HO. 8166 or HE. 1128
ELMER G. DYER
Extends the season's greetings to all members of Local 659, I. A. T. S. E. and desires especially to thank the following named brothers for courtesies extended while engaged with them in the filming of these productions.
Dan Clark "Air Circus"
Al Siegler "The Big Hop"
Harry Perry "Hells Angels"
Joe Walker "Flight"
Bob Kurrle "Evangeline"
Ernest Miller "Troopers Three"
Jack Rose Tiffany-Stahl
Hal Moore "Le Marseillaise"
Charles Glouner Universal
Harry Newman Hoot Gibson Prods.