Projection engineering (Jan-Dec 1931)

Page scan 000109 from Projection engineering

Record Details:

Title:
Projection engineering
Date:
Jan-Dec 1931
Publisher:
New York : Bryan Davis Publishing Co., Inc.
Volume:
Projection engineering (Jan-Dec 1931)
Leaf #:
000109
Language:
English
Collection:
Technical Journals
Format:
Periodicals
Contributor:
Library of Congress, MBRS, Moving Image Section
Sponsor:
Library of Congress, Motion Picture, Broadcasting and Recorded Sound Division
Coordinator:
Media History Digital Library
Date Added:
July 04, 2024
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APRIL, 1931 Page 29 Hoffmann Soons The Only Union Made Rheostat We Build Rheo stats for Special KfQiiirf ments. C o m m u n icate With Us Di \ rect. There \ Is No Ob \N ""•'• Every known quality necessary in producing perfect projection is embodied in perfection rheostats. PERrKTION Recognized as the highest standard everywhere [Sold by all branches of the National Theatre "71 Supply Co., Sam Kaplan, New York, and by your dealer. JJ R Now equipped with solderless adjustable lugs to take wire size from No. 4 to 4/0 without additional ELECTRICAL & ENGINEERING CORPORATION HOFFMANN SOONS 387 FIRST AVE., NEW YORK HEOSTATS DIRECT READING TYPE 586 Power-Level Indicator An open clearly marked decibel scale makes the General Radio TYPE 586 Power-Level Indicator a truly direct-reading instrument. The time saved and the freedom from costly mistakes such a scale insures are advantages readily appreciated by the monitoring operator in the broadcast and recording studio. If you are not familiar with this instrument, a request on your business letterhead will bring you a catalog description. Please ask for Bulletin 932-P. GENERAL RADIO COMPANY Offices CAMBRIDGE A, Laboratories Factory MASSACHUSETTS o hum, noise FOREST RECTIFIER Leading Sound Recording Studios, Theatres, and Laboratories where unfaltering current supply is required use FOREST — because it is superior. Adaptable to all sound equipment — interchangeable with your present storage battery— several types. Just tarn the switch to convert a 110 or 220 v. a-c. into fully filtered d-c. FOREST ELECTRIC CORP. New and Wilsey Steets Newark, N. J.