Electromechanical switching methods for telephone exchanges Part 2

The Essential Electrical Switch Part 1

Summary of the Rotary Stepper switch with demos

Dynamotor explainer with demos and a beautifully restored version from 1895

Signal Interrupters for 7A rotary exchange

Panel sequence switches example

Ringing Machine used in 7A Rotary exchange

The reverse dial, dialing #70065

Telephone relay tester device demo

Solo rotary stepping switch demo

Ringing machine and interrupter demos

Revertive pulsing example Rotary

Keith line switch shaft rotation demo

Keith Line Switch demo

Ericsson XY testing demos

Crossbar demo up close

Panel exchange 7-digit dialing, annotated with dialog

Panel Exchange switches overview

Dialing a 5 digit number on the 7A rotary system.

7A rotary- two digit recorder example

7A Rotary line finder

7A Rotary selector demo

7A Rotary Final Selector and Sequence Switch actions

Step-by-Step dialing demo at JKL Museum - calling315 site

Strowger switch demo for 2 digits in slow motion

Under the Hood "Tribute to Telephone Relays"

Live demo of Tribute with Joshua

Introduction to electromechanical telephone systems