How telegraphs and telephones work, explained in nontechnical language

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DC Field	Value
dc.contributor.author	Gibson, Charles R.
dc.date.accessioned	2020-07-17T10:18:46Z
dc.date.available	2020-07-17T10:18:46Z
dc.source	National Library of India, Kolkata
dc.format.extent	various pagings: 5 ill.; 10 diagrams
dc.format.mimetype	application/pdf
dc.identifier.uri	http://nlirepository.nvli.in//handle/123456789/23079
dc.language.iso	en
dc.publisher	Seeley, London
dc.subject	Telegraph Telephone
dc.type	E-Book
dc.date.copyright	1909
dc.format.medium	text

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Part 1