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Stobie pole
A Stobie pole is a power line pole made of two steel joists held apart by a slab of concrete. It was invented by Adelaide Electricity Supply Company design engineer James Cyril Stobie (1895–1953).〔R. W. Linn, ('Stobie, James Cyril (1895–1953)' ), Australian Dictionary of Biography, Volume 16, Melbourne University Press, 2002, pp 314–315.〕 Stobie used materials easily at hand due to the shortage of suitably long, strong, straight and termite-resistant timber in South Australia.
==History==
In July 1924 the patent application for the pole design was submitted in both English and French, and accepted in November 1925. Stobie described his invention as
"an improved pole adopted to be used for very many purposes, but particularly for carrying electric cables, telegraph wires... () consists of two flanged beams of iron or steel, preferably rolled steel joist of 'H' or of channel sections, placed one beside the other with their flanges inward and preferably at a very slight angle one with the other and held together by means of tie bolts, the space between them being filled with cement concrete."〔Rob Linn, ''ETSA – The Story of Electricity in South Australia'' (1996) pp.38–39〕
Stobie and John Brookman were so confident of the new pole that they formed The Stobie Pole Syndicate for the purpose of patenting the design and then selling the patent or manufacturing rights. The Hume Pipe Company became their first agents and, while there were numerous international enquiries, South Australia has largely remained the only place where they are widely used.〔
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