Library and Archives
Library and Archives - Electrical Technical Papers of the 1950s and Radio Objects from the 1920s/1930s
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January 22, 2015
Electrical Technical Papers of the 1950s and Radio Objects from the 1920s/1930s

The IET Archives recently received a donation of electrical technical papers, dating primarily from the period 1949 to 1955. These papers were amassed by Edward J Back when he was working as a Technical Assistant in the 1950s for the Consulting Engineering Department of the Company Johnson & Phillips. Edward Back was a Graduate member of the IEE before becoming an Associate Member in 1953. This collection has been catalogued with the reference SC MSS 262.

Whilst many of the papers and articles were from journals that can be found in the IET Library such as ‘Distribution of Electricity’, ‘Electrical Times’, ‘The Electrical Journal’ and ‘Electrical Review’, these readily available articles were interspersed with letters and memoranda typically written by S Austen Stigant the Technical Adviser at Johnson & Phillips. The papers are organised by subjects including cables, electro-technology, rotating machinery, transients, and transmission.

The subject matter is understandable given that Johnson & Phillips was a cable making and wire rope machinery company founded in 1875 which by the 1950s had become a specialist in the area of transmission transformation and control of electricity. It manufactured electric cable, cable accessories, switch gear, transformers, capacitors and overhead line materials. It was acquired by the Delta Metal Company in 1964.

The collection is a useful addition to the IET Archives technical collections, particularly because the collection includes brochures and publications of other companies involved in the manufacturing of electrical equipment such as the English Electric Company, British Insulated Callender’s Cables (BICC), and Ferguson Pailin. The illustrations below are from a BICC publication from the early 1950s for its power capacitors which show a layered section diagram of its automatic power factor correction equipment for capacitors.

All layers of diagram showing;

 

 

Overlay 1 removed;

 

 

Radio Objects from the 1920s/1930s

As is quite often the case with collections of papers formed by individuals, some small objects, related to the individual are donated along with the papers. In this case Edward Back was likely to have been a radio enthusiast because the collection included a radio microphone dating from the period 1935-1940, inductors used in radios (coils of wire wrapped on a Bakelite core), and a permanent detector used in crystal radio sets from the 1920s.

The Telsen Electric Co (1935) Ltd ‘Ace’ spring-suspended microphone (type 68) is shown below;

 

 

 

Telson Electric Limited was a British firm that made a spring-suspended microphone (Ace brand) from 1930 to 1939. The company, founded by A Macnamara, based in Birmingham was active from 1924 to the 1940s, and manufactured wireless broadcast receivers, components, microphones and construction kits. It was founded by A Macnamara and had a cabinet making department which made the furniture into which the wireless receivers were built. It purchased Bakelite cases from Edwin Elliot of Birmingham; produced components for the building of a home wireless receiver, and produced blueprint layouts for home construction. The company went into receivership in 1935 but was then bought out of receivership. After this the company traded as The Telsen Electric Company (1935) Limited.

Telsen microphones were used for both home recording and public address. The Science Museum has a Telson microphone in its collection but that is a different model, likely to be a model 58, rather than the microphone above which is a model 68. Here is a link to the model in the Science Museum collection. Telsen Ace microphone at Science Museum.

 

SC MSS 262 can be consulted in the IET Archive Centre. Details for visiting the Archive Centre can be found on the archive web pages here - Archive Centre details.



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Jon Cable
Assistant Archivist
The Institution of Engineering and Technology

   

    Posted By: Jonathan Cable @ 22 January 2015 03:11 PM     Archives  

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