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Apart from the Strowger two-motion selectors, many exchanges
were packed with rows and rows of sub's uniselectors, lamps,
test jackfields, wiring blocks and lots of sundry items to
enable all of the equipment to work together. Trunk
exchanges had other wonderful kit, such as, motor
uniselector groups (MUGs) and RTs or Registers.
Here we look at a selection of equipment...
Photo: MUGs routiner
control (Trunk Auto) © Dave Milner 1994.
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Overview
In a very large exchange there would have been rows and rows of
racks, all cram-packed with every conceivable piece of equipment,
essential in the workings of the telephone service, of bygone days.
Every nut, bolt and length of angle-iron fitted together to give the
impression of a solid mass of electro-mechanical equipment and all
painted in Light Straw (cream) coloured paint.
Equipment Practice
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In this section we look at equipment
practice; racking types, exchange layouts, paint colours,
lighting and decor.
Photo: Light Straw
angle-iron forming a section of a MDF with lighting outlet
and overhead cable mesh ©
LSA May 2012.
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Lamps, Signalling No...
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From lamps, signalling, no.2, 6 volt, to the larger
section alarm lamps, all played an important part in the
running of a typical telephone exchange.
Photo: Section/rack alarm
lamps ©
LSA May 2012.
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Relays & Relaysets
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The 3000 type relay evolved from a number of designs by
different manufacturers, as Volume 27 Part 1 of the Post
Office Electrical Engineers Journal, April 1934 explains...
Photo: A shelf of 2000-type
relaysets at the bottom of a meter rack ©
LSA 2008.
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Uniselectors
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Uniselectors, single motion step by step
switches, usually arranged in an arc of 25 positions. Types
1, 2 and 3 standard sizes. Type 4, miniature.
Photo: A shelf of Sub's
Unis, with homing arcs. Red, blue and orange multiple wiring ©
LSA 2005.
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