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Pellseinydd · 13th Mar 2019, 11:09 pm

Dropwire was introduced in early 1930's and used a small eccentric wheel known in the 'Vocabulary of Engineering Stores' as 'Clamps, Eccentric' for some reason

They can still be seen around if you look ! This is a twin wheel version
but most were a single wheel. See Herbert & Proctors 'Telephony' Volume 1 pages 1159/60

The cable was one pair with cadmium copper conductors known as 'Cable, I.R.V., Braided and Compounded' - (IRV = India Rubber Vulcanised)
Three types - Black, Grey or 'PBJ'.

Only the PBJ was still in use with a sliding copper clamp with a loop around an inch across which was dropped over a spindle when I started with the GPO as a YIT in the 1950's.

13th Mar 2019, 11:09 pm	#33
Pellseinydd Heptode Join Date: Jul 2007 Location: Flintshire, UK. Posts: 707	Re: External telephone line junction box. Dropwire was introduced in early 1930's and used a small eccentric wheel known in the 'Vocabulary of Engineering Stores' as 'Clamps, Eccentric' for some reason They can still be seen around if you look ! This is a twin wheel version but most were a single wheel. See Herbert & Proctors 'Telephony' Volume 1 pages 1159/60 The cable was one pair with cadmium copper conductors known as 'Cable, I.R.V., Braided and Compounded' - (IRV = India Rubber Vulcanised) Three types - Black, Grey or 'PBJ'. Only the PBJ was still in use with a sliding copper clamp with a loop around an inch across which was dropped over a spindle when I started with the GPO as a YIT in the 1950's.