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Electrical Products Manufacturing Company, 69 Sprague St, Providence, RI was established in 1919 14 . President was Frank E Dyson, Vice President was Thomas P Giblin, Secretary and general manager was H A McAvoy and Treasurer was Charles Eddy. 1 Frank E Dyson was also formed the Commercial Radio Company of America with Thomas P Giblin, and Ratcliffe G E Hicks 5.

In 1920 Electrical Products Manufacturing Company had radio station 1XF transmitting at both 300 and 600 wavelength. 3

In 1922, Dymac leased large floor space at 24 Fountain St, in Providence in addition to their regular plant. 2

The 1923 Journal of the A.I.E.E. (American Institute of Electrical Engineers) lists Mr Omar E Cote as the Chief Engineer. 4 and their address as 69 Sprague Street 10.

In 1924 Electrical Products Manufacturing Company hired the Lachar-Horton Company to direct advertising for the firm. 11

In 1925 Electrical Products Manufacturing Company brings Charles V Logwood on as their chief engineer. Mr Logwood was the co-inventor ,with Dr Lee Deforest, of the audion tube, which made broadcasting possible. He alone discoverd the Audion amplifier which came into use in 1912. He also directed the installation of the first three broadcast stations in the United States. 15



In 1925 Electrical Products came out with a new catalog describing their new product line and factory 16

Dymac Selecto Five radio receiver
Dymac loud speaker
Dymac head sets types "F", "G" and "E"
Dymac vernier dials
Dymac sub-panel sockets
Dymac standard rheostats
Dymac potentiometers
Dymac variable condensers
Dymac audio-frequency transformers types "G", "H" and "E"
Dymac audio amplifying transformers type A-1
Dymac standard jacks
Dymac duo lateral coils
Dymac crystal set outfit
Dymac standard electrical soldering iron kit


The 1926 Providence Directory still lists Frank E Dyson president but now H A McAvoy in the treasurer and Ratcliffe G E Hicks, Secratary. The company is still at 69 Sprague Street with 150 employees. 6

I know from their ads they made headphones, speakers and a 5 tube set called the selecto-five 12. There is also an ad for a six-tube receiver kit.

In the 1927 Providence Directory there is a listing for George W Hamilton as tresurer 7.

In 1928 the factory was turning out 116 coil types for the Signal Engineering Corporation of the U S Government. The factory did all the work for the radio department of the United States 13.

We find Electical Products Manufacutring Company still listed at 69 Sprague Street in 1929 8, and 1932 9 and then again in 1932 with the addition of George W Hamilton as the receiver 9.


Click to enlarge
Radio Call Book, Fall, 1923


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Duo-Lateral Coils
35 snd 50 Turn


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35 Turn Duo-Lateral Coil

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35 Turn Duo-Lateral Coil

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50 Turn Duo-Lateral Coil

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50 Turn Duo-Lateral Coil

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Dymac AF Transformer, 3 1/2 to 1 Ratio
1924

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Dymac AF Transformer, 3 1/2 to 1 Ratio
1924

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Dymac Type-E Headphones, 1923

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Dymac Type-E Headphones, 1923

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Electrical Products Manufacturing Headphones

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Electrical Products Manufacturing Headphones

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DYMAC TYPE-C LOUD SPEAKER
Phonograph Attachment

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DYMAC TYPE-C LOUD SPEAKER
Phonograph Attachment

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DYMAC TYPE-C LOUD SPEAKER
Phonograph Attachment


DYMAC TYPE-F Headphone

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DYMAC TYPE-G Headphone
In origional box.

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"Dymac Somerlog" Receiver
Popular Radio, November 1926

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Radio Retailing July 1926

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Radio Retailing July1926

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Providence Journal
January 27, 1924

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Radio Retailing February 1926

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Radio Call Book, Fall, 1923

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Radio Retailing January 1926

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Radio Industry September, 1925

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Citizens Radio Call Book, Fall, 1924

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Citizens Radio Call Book, Fall, 1924

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Dymac Selecto Five
Radio News, December, 1925
Providence, RI

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Dymac Selecto Five
Radio News, May, 1923
Providence, RI

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The Brooklyn Eagle
November 2, 1925

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Radio Retailing April 1926

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Radio Retailing February 1926

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The Brooklyn Eagle
October 26, 1925


Popular Radio
March 1926

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Altoona Tribune
March 22, 1924

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The Brooklyn Eagle
April 29, 1925

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The Brooklyn Eagle
April 1, 1925

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The Bee April 24, 1924

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Tampa Bay Times
January 9 1921

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The Daily Courier
January 15, 1926

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The Davenport Democrat and Leader
December 12, 1924

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Suburbanite Economist
March 11, 1925

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Altoona Tribune
March 22, 1924

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The Morning Herald
February 12th 1926

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The Daily Courier
January 15th 1926

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The Brooklyn Daily Eagle
Thursday March 4th 1926

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The Morning Herald
January 8th, 1926

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The Cincinnati Enquirer
March 23 1924

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News-Journal
September 23 1925

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The Akron Beacon Journal
September 18, 1925

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Asbury Park Press
December 9, 1925

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The Cincinnati Enquirer
March 9, 1924

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Chicago Tribune
January 4, 1925

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News-Journal
March 13, 1927

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Providence Journal
January 31, 1926

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Altoona Tribune
March 27, 1924

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The Daily Courier
February 11, 1927

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The Morning Herald
March 13, 1926

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The Brooklyn Eagle
March 22, 1925

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Electrical News
Toronto
February 1 1922

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The Brooklyn Eagle
February 1, 1925

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The Davenport Democrat and Leader
October 18, 1925
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Dymac Six-Tube Receiving Kit
Radio News, December, 1926
Providence, RI
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Radio Industry September 1925

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Dymac Selecto Five
Providence, RI


Altoona Tribune
March 27th 1924

The Electrical Record, Vol XXXI,
January ,1922

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Popular Radio, April 1925

Brooklyn Daily Eagle
June 2nd, 1925

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The Brooklyn Daily Eagle
May 21, 1925

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News-Journal
March 6 1927

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Asbury Park Press
October 10 1925

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Asbury Park Press
December 30, 1925

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News-Journal
September 28, 1925




PATENTS


US1520466
TELEPHONE HEADSET

US1540514
COIL MOUNTING

US1520466
TELEPHONE HEADSET



ARTICALS




1 EMF Electrical Year Book, Volume 1, 1921

2 Electrical World, Volume 79, 1922

3 Commercial and Government Radio Stations of the U.S., 1920

4 1923 A.I.E.E. Journal

5 Acts And Resolves Passed By The General Assembly Of The State Of Rhode Island And Providence Plantations, 1920

6 Providence Directory, 1926

7 Providence Directory, 1927

8 Providence Directory, 1929

9 Providence Directory, 1932

10 Providence Directory, 1923

11 Advertising and Selling Fortnightly, November 1924

12 Radio Call Book, Fall, 1923

13 Asbury Park Press September 28, 1925

14 Electical Review Vol75 July 4-29, 1919

15 Talking Machine September 1925

16 Talking Machine September 1925