Messengers for mankind
By: by Wilfrid L. Randell ...
Series: Conquest of space and time
Publisher: Hutchinson & Co., Ltd
Published: 1940
Place of publication: London
Language: eng
Number of pages: 240
Subjects: Telecommunication.; Postal service -- History.
Notes: Half-title: Hutchinson's illustrated library of modern knowledge, edited by W. S. Shears. no. 5
Table of contents: title: Signals and codes.; title: General post.; title: Faraday.; title: Electric telegraphy.; title: The telephone.; title: Wireless.; title: Cables and cable laying.; title: Transmission of pictures.; title: Broadcasting.