[D8239ZFI], Letter from John Hopkinson to Edison Electric Light Co Ltd, September 30th, 1882

Item

Abstract

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.

Date

1882-09-30

Decade

1880-1889

Type

Identifier

D8239ZFI

Folder Set

D8239

Title

[D8239ZFI], Letter from John Hopkinson to Edison Electric Light Co Ltd, September 30th, 1882

Microfilm ID

62:1118

Publisher

Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University