Grace's Guide

British Industrial History

Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 130,460 pages of information and 207,757 images on early companies, their products and the people who designed and built them.


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Exhibit at the Washford Radio Museum.
February 1936.
September 1937.
August 1948.
December 1951.
June 1955. Valve Meter Mk III.
March 1957. Model 7.
May 1958. Valve Characteristic Meter Mark IV and Transistor Analyser CT446.
May 1960.
May 1960. Model 7.
May 1960. Model 8.
October 1961.
October 1961.
October 1961.

Avo Ltd, makers of meters and test gear, of Avocet House, 92-96 Vauxhall Bridge Road, London, SW1

1923 Private company Automatic Coil Winder and Electrical Equipment Co formed

Donald Macadie, a Post Office engineer, dissatisfied with having to carry many separate instruments, invented a meter that could measure Amps, Volts and Ohms - the multifunction meter was named AVO. Macadie took his idea to the Automatic Coil Winder and Electrical Equipment Co. The first AVO was put on sale in 1923, initially a DC-only instrument. Many of its features remained almost unaltered right through to the last AVO Model 8.

1957 Address: Avocet House, Vauxhall Bridge Rd, London[1].

1957 Became public company: Avo Ltd, of Avocet House, Vauxhall Bridge Rd, London, to manufacture instruments with the AVO trademark.

1958 Took over Taylor Electrical Instruments Ltd of Slough[2].

1959 Metal Industries Ltd acquired Avo Ltd, including its subsidiary Taylor Electrical Instruments Ltd.[3]

1961 Manufacturers of electrical, electronic and nucleonic measuring instruments and coil winding machines. 700 employees. [4]

1962 Acquired land at Dover for new factory[5]. Known particularly for their Avometer general purpose multimeter, Avo also made a wide range of test gear including valve testers, electrical, electronic and nucleonics instrumentation.

1967 Thorn Electrical Industries took over Metal Industries

c.1986 Took over Evershed and Vignoles, another member of the Thorn EMI group.

1987 The name of the company was changed to Megger Instruments Limited at Archcliffe Road, Dover.

See Also


Sources of Information

  1. The Times, 28 May 1957
  2. The Times, 5 December 1958
  3. The Times, 8 July 1959
  4. 1961 Dun and Bradstreet KBE
  5. The Times, 2 August 1962