[D8239ZFI], Letter from John Hopkinson to Edison Electric Light Co Ltd, September 30th, 1882
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Title
[D8239ZFI], Letter from John Hopkinson to Edison Electric Light Co Ltd, September 30th, 1882
Editor's Notes
Edison dynamos "designed with a vew to the greatest economy of power" but will even when we bid out their mft we will probably find "that they are costly in proportion to their output. In many caases prime cost is of more importance that ecnomoy of coal. Cases also occur in which it is desirable to vary the conditions under which the machine works, for example the speed of rotation. It is therefor necessary to make a critical study of the machines with a view not along of improving them but of placing ourselves in a position of being able to say beforehand how we should modify a machine to meet varying conditions." Eg., steamships, where operator insist on direct connection, which requires running at lower rpm. Discusses some experiments by Fleming on substituting armatures from different Edison machines and wiring magnets in series to enable operation at different speeds. Will make more complete experiments when complete drawings available.
Author
Recipient
Mentioned
Date
1882-09-30
Type
Subject
Folder/Volume ID
D8239-F
Microfilm ID
62:1118
Document ID
D8239ZFI
Publisher
Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University