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<p>[QUOTE=&quot;Makanudo, post: 124974, member: 1297&quot;]Heres a translation of the last paragraph from that page:</p><p>&quot;In the pioneer period telegraphy we have invested a lot of effort in isolating naked telegraph wires. As long it took to have invented an appropriate insulator. Trial used a tube of glass, porcelain, clay and gutta-percha. Insulators are fastened to the pole and wire wrapped around them. At the big humidity it was also such a deteriorated insulation. Thus, at the beginning of insulators covered with a canopy. The solution has proven to be bad, because on the isolators is bad weather coming by appearing and the sinks. Always harder it showed the need to make one part of the insulator completely protect against moisture. When the circumflex get the insulator is get the image of the bell.In 1852 they began to fasten the bell insulators on poles. These have not been practical, but they are well isolated bare conductors. From them he has developed a new insulator shape resembles a bell in the bell. They called it a double bell. During telegraph lines formed a large number of different insulators, which by design derived from a double bell. With time on them fooled dust, soot and dirt, especially along the railroad. So dirty insulators especially in bad weather causing drains. Therefore, they have occasionally washed and cleaned. Guides at the beginning of using a copper wire that was soft and is often torn. To improve the mechanical properties are starting to use hard copper alloy, copper, phosphorus, silicon and chromium. The Austro-Hungarian Administration of telephone wires is used silicon bronze. Since then copper was expensive, it has happened several times that people wire harvested and sold. Therefore, in some cases using a galvanized iron wire, which is less costly, but had poor conductivity.&quot;[/QUOTE]</p><p><br /></p>

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