Re: Telegraph poles: historical data?
Here's some info on insulators, poles, and ironwork from the GEC catalogues of 1893 and 1914. Also the rather brief entry on telegraphs from the 1899 "Molesworth" pocket book, which does show two types of telegraph pole in cross-section. The GEC catalogues do not illustrate poles, but the 1893 catalogue does give dimensions and prices.
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