Extension cable, manufactured by General Radio, United States of America, in the 1930s

This extension cable was used by architect and acoustician Hugh Vivian Taylor.

Hugh Vivian Taylor started practice as an architect in Victoria, Australia during 1923 and in acoustics in 1928.

The arrival of "talking pictures" in Australia in 1929 required acceptable acoustic conditions to ensure satisfactory reproduction of the sound. From 1930 to 1941 he acted as consultant for at least 434 theatres and public halls.

Acoustic equipment is used to measure the intensity of sound within an environment, for example outdoors or within a building.

The equipment consists of a microphone and sound level meter to pick up the sound, an analyser to determine the properties of the sound, for example, frequency and intensity, and an output meter to measure these properties. In some cases, sounds are produced using test records, for example in a building,

The key instrument is the sound level meter with its microphone. All the other instruments take their input from the sound level meter. These instruments include sound and vibration analysers and tape recorders. In the case of measuring vibrations, the microphone is replaced with a vibration pickup.

The extension cable can be connected to the microphone socket of the Sound Level Meter and the other end connected to the microphone. This allows the microphone to be placed on a stand some distance away from the Meter and in different locations.

The extension cable can be connected in a similar way with the Vibration Pickup Control Box instead of the microphone, when vibration analysis is being carried out.

Physical Description

Black cable with metal connectors at each end


The arrival of 'talking pictures' in Australia in 1929 required theatres to have appropriate acoustic characteristics. From 1930 to 1941, H. Vivian Taylor was the architectural and acoustical consultant for at least 434 theatres and public halls.

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