[LB007533], Letter from Thomas Alva Edison to Charles Batchelor, June 19th, 1882

https://edisondigital.rutgers.edu/document/LB007533

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Title

[LB007533], Letter from Thomas Alva Edison to Charles Batchelor, June 19th, 1882

Editor's Notes

In putting up large installations for that matter small installations look out for the drop of pressure Our [Cables] are made for [al--] of 5 percent. This is 5 volts now a difference of 5 volts will make the [lamp] and the machine [say] 16 candles & the last lamp 6 candles or 25 or 30 candles [illegible text] and 16 on the last lamp. We [--] [--] changed that [here] We only allow 2 percent loss from the 1st lamp to the last and make the loss 5 8 or even 12 percent on the wire leading from the machines according to circumstances for instance [diagram follows]##The Conductor leading from the machine having no lamps on any [difference] [dont] [effect] while the current on which [---] are having but [2-] volts fall the the different candle power is not [reliable] Now in your large installations you must look sharp after this and I think in most places you will have to [calculate] for a loss of 2 percent on the tubes carrying the light and two to 12 percent on your feeder thus [diagram follows]##a loss of 5 percent on your lamp Condrs would be too much. In Square Coils installations without a model is put up on a board & the pressure & position of feeder [venvatily] determined, general [distribution] would [be] [a] failure on these would [uncertain] hours be a difference of 15 Volts which would bring some of the lamps to 40 candles

Recipient

Date

1882-06-19

Type

Folder/Volume ID

LB007-F

Microfilm ID

80:655

Document ID

LB007533

Publisher

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