Radio Broadcast (May-Oct 1925)

Record Details:

Title:
Radio Broadcast
Date:
May-Oct 1925
Publisher:
Garden City, N.Y., Doubleday, Page & company [etc.]
Volume:
Radio broadcast ..
Leaf #:
000333
Language:
English
Subjects:
radio periodical, Radio -- Periodicals
Contributor:
Library of Congress, MBRS, Recorded Sound Section
Sponsor:
Library of Congress, Motion Picture, Broadcasting and Recorded Sound Division
Coordinator:
Media History Digital Library
Description:
Radio Broadcast supported home listeners of the new technology of radio – for building or buying a receiving set to explaining the technology used by the new radio stations. Throughout the magazine shows the cultural influence of radio as it evolved from hobbyist to mainstream. -- David Pierce, 2011
Date Added:
September 29, 2022
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RADIO BROADCAST ADVERTISER 309 The speaker with seven superior features 1. Permanent Magnet. Sensitivity and volume depend on a magnetic field maintained constant by a permanent magnet. The magnet in the Thompson Speaker is about four times as large as the magnets used in the ordinary "loudspeaker." 2. Actuating Coils. Of generous size, wound of wire heavy enough to withstand currents needed to produce great volume. Insulated to withstand higher plate-voltages than the small coils used in the "telephone type" loud-speakers. 3. Laminated Pole -pieces. More costly than solid pole-pieces, but they add to sensitivity and permit a wider range of sound-vibrations. 4. Driving Armature. Fixed at one end and fastened to the apex of the conical diaphragm at the other end. Movement at diaphragm twice that at pole-pieces, permitting reproduction of very loud sounds with a narrow air-gap, insuring both volume and sensitivity. 5. Conical Diaphragm. Effective area 50% greater than flat diaphragm of same diameter. Entire cone moves. Sound created for given movement 100% greater than for equal movement in a flat diaphragm. Result : Better tonal quality and greater volume. 6. Volume Regulator. In one turn around, varies air-gap from zero to maximum. Permits regulation for varying strength of near and far stations. 7. The Thompson Horn. Moulded composite horn delivers sound-waves from diaphragm without adding distorting waves of its own. Double bend gives effective horn-length of 27 inches, in an instrument which (including base) measures only 23 inches high over all. R. E. THOMPSON MANUFACTURING CO., 30 Church Street, New York CDompson * SPE/1KER Thompson Tone Stands Alone •ft Tested and approved by Radio Broadcast ^