The Thomas A. Edison Papers Digital Edition

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Metadata

Title

[LB007602B], Letter from Richard Nott Dyer to Zenas Fisk Wilber, June 28th, 1882

Editor's Notes

Since writing you on June 5th. in regard to [outamabia] regulations, it has been discovered that the patent of Maxim 238,543, June 8th. 1880, shows and electro magnet placed in a multiple arc circuit and [controlling circuit of another electro magnet which regulates generation. This patent is probably earlier than the [runs] by mr Edison of an electro magnet in multiple arc for regulating the machine: but mr Edison before that date regulated a lamp or lamps by a regulator controlled by an electro-magnet in multiple arc. Hence for the broadest claim in case 3[7]5 it might be advisable to cover the use of a device placed in a multiple arc circuit and affected the same as a lamp, for regulating a lamp or lamps, whether directly or through the machine. The word "device" or some similar broad expression should be used since a thermostatic device may be used in place of an electro-magnet and perhaps other devices. On the thermostatic device, I am now preparing the papers for a separate application. Another feature of importance is the closing of [line] circuits by the device in multiple arc, so as to give regulating mechanism movement in [off]site directions. This is not shown by Maxim. A more important feature however, is the centered electro magnet.##By reference to case 375 you will see that lever E is held against Spring lever g in a central position. In John Ott's case the other form of device for this purpose is shown and should be claimed specifically. That device consists of [two] springs like this [diagram shown]##If the lever is centered it does not [act] except upon a definite charge in electromotive force, and the flickering of the light which is caused by a too sensitive action of [the] magnetic [prevented.]

Author

Dyer, Richard Nott

Recipient

Wilber, Zenas Fisk

Mentioned

Maxim, Hiram Stevens

Ott, John F

Date

1882-06-28

Type

Letter

Subject

Patent application

Dynamos and generators

Electrical distribution system

Folder ID

LB007-F

Microfilm ID

80:695

Document ID

LB007602B

URL

https://edisondigital.rutgers.edu/document/LB007602B

Rights

Thomas Edison National Historical Park

Publisher

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

License

CC0 1.0 Universal

Has Version

Archive.org Viewer, Microfilm Series Reel 80

Item sets

[LB007-F] LB-007 (1881-1882)