Shows by diagrams, models and live action the basic working of an automatic telephone exchange. Comparisons with a manual exchange. Demonstrates working of a uniselector, dialling a number and the subsequent connection. Shows correct method of dialling.
How to watch
Collection
In ACMI's collection
Credits
Collection metadata
ACMI Identifier
010685
Language
English
Subject categories
Communications, Infrastructure, & Transport → Telecommunication systems - History
Communications, Infrastructure, & Transport → Telephone - History
Economics, Philosophy, Politics, Religion & Sociology → Technology - Social aspects
Educational & Instructional → Educational films
Educational & Instructional → Instructional
Mathematics, Science & Technology → Technology - Social aspects
Sound/audio
Sound
Colour
Black and White
Holdings
16mm film; Access Print (Section 1)