[D8637ZAA], Letter from William Symes Andrews to Dyer and Seely, October 3rd, 1886


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[D8637ZAA], Letter from William Symes Andrews to Dyer and Seely, October 3rd, 1886

Editor's Notes

Replying to yours of 9/24 [D8637Y], would note that Harrison's object is very different from ours; the arrangement of two or more induction coils so that the current from one will induce a current in another Harry did years ago and is not patentable, but a specific object for using such an arrangement should be patentable; Harrison's object is to create a sort of relay which he thought to use to carry current long distances when he took out patent; Our object is entirely different; we want to use successive coils to either increase or decrease the EMF of dynamo as required; [includes drawing]; arrangement would economize on copper in long main line; we would 1) effect a high economy in conductors; 2) reduce number of expensive machines by reason of careful insulation; another application: Use a 500-volt dynamo with a 5000 volt converter close by, which is less dangerous than 5000 volt dynamo; percent of loss would be more than compensated by advantage; give this thought and advise; last paragraph of your letter suggests you thought to use only one converter, but a number would be used; see sketch.





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