Pipe for electrical installation that is no longer used , into which individual insulated wires have been drawn. It was named after its manufacturer, Bergmann Elektrizitätswerke AG in Berlin, founded by Sigmund Bergmann .
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Originally the pipe consisted of a waterproof ( bitumen-soaked ) paper mass without a protective jacket. From around 1900 it was given a folded jacket made of sheet brass , leaded sheet steel or sheet steel with an aluminum coating to better protect the paper pulp .
Bergmann pipes were manufactured in 3 m long rods with an inner diameter of 9, 11, 13½, 16, 21, 23, 29, 36 and 48 mm. With split sleeves, the pipes could be connected to each other after the lines had been pulled in.
Wide bends could be produced with pipe bending pliers, these pliers were used to press notches lying close together in the inside of the desired bend, so that the pipe was shortened here and a bend was created.
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