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Title: Varley's carbonised cloth rheostat by Townson & Mercer [Go to resource]
Description: Varley's carbonised cloth rheostat by Townson & Mercer, consisting of a number of cloth discs which can be compressed by a screw License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Temporal: 1890-1939 Source: Science Museum Creator: Townson and Mercer (maker) Identifier: 1983-1017 Go to resource More Like this...
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