How a Dial Phone Works (2/2)

Part 2: Details

LM Ericsson Rotary Telephone around 1970's and 80's

Automatic exchanges, or dial service, came into existence in the early 1900s. Their purpose was to eliminate the need for human switchboard operators who completed the connections required for a telephone call.

How a Dial Phone Works (1/2)

Part 1: General

Since using all my early life dial phones but never actually studied how do they work .. now it is the time. In this article I open a LM Ericsson rotary telephone and figure out how it works and how does the automatic central connect the caller to called.

A dial phone opened with its basic parts visible: base plat, PCB (Printed Circuit Board), ringer, dial plate, cover, handset with microphone and receiver capsules in it, plug and cables.