Dial Document Links

• AEI Ltd: Instructions for maintaining and repairing Dials No. 20, 1956 (extremely comprehensive).
• Aitken: extracts from his book Automatic Telephone Systems (1921) concerning Dials.
• Automatic Electric: Maintenance and repair of type 24a36 dial.
• British Post Office: Dial No. 3 - Siemens Brothers Patent in Montreal - Description - Claims - Drawings
• British Post Office: Educational Pamphlet 5/1 'Telephone Dials' (training text).
• British Post Office: Engineering instructions A3118 (Dial No. 20), A3215 (storage of Dial No. 30), B1003 (dials in general).
• Dial No 24 (American) - Operation and maintenance.
• Commonwealth of Australia: Dials in use in 1929.
• Ericsson Telephones Ltd: Advertisement for dials (mid-1950s)
• Ericsson Telephones Ltd: Trigger Dials N19877, N4381, N4383A, N43941A (Ericsson/Plessey Works drawings).
• GEC Ltd: Catalogue leaflet DSL1a for Dial No.20, late 1950s.
• USA: article on Dials used in North America by Bruce Crawford.

Last revised: March 31, 2023