Telephones

A Fubsy Polymath subdomain

Telephones

Telephone switching from the operator's switchboard to step-by-step and crossbar: the electromechanical PBX gear I collect, how each stage works, and the mini PBX I am building, with three phones and LEDs that let you watch every call being set up.

2 of 2 topics live so far.

Photo: Working step-by-step demonstration band: line finder, 1st selector, 2nd selector and connector, The Telephone Museum, Waltham, Massachusetts by ArnoldReinhold · CC BY-SA 4.0

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sten gun
pages with both words
"sten gun"
the words together, as a phrase
sten OR sterling
either one (| works too)
sten -replica
leave out pages that mention “replica”

Without quotes, the last word also matches longer words that start with it (sten finds Stenophylla), and close word forms count (rifle finds rifles). Tick Exact words to match whole words only.

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Live
Ae Type 26a Switch Tester 4 volumes deep dive Live
Live
Telephone Switching History 8 volumes deep dive Live