[D8736AAN], Letter from Charles T Porter to Charles Batchelor, February 18th, 1887


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[D8736AAN], Letter from Charles T Porter to Charles Batchelor, February 18th, 1887

Editor's Notes

"A few days ago Mr Hutchinson asked me to call your attention to the [-----] of a directly connected engine to drive the dynamos on board ships. ## I told him you had introduced the matter on our trip to Schenectady, but I had not yet set about it. He asked me to speak to you about it with a view to my designing such an engine as soon as practicable. ## I have given the subject considerable thought, and about settled on the general plan for such engines, and am prepared to undertake any speed desired. The engines would be extremely simple, of 6", 5", or 4" stroke, according as lower or higher relative spread was required, and with a fixed cut off (by lap of a piston valve driven from an [--]centric) at about 5/8 stroke, and regulated by a throttle. ## In about a fortnight I expect to have the drawings for this engine off my hands though Mr Little will still have considerable to do on them) and shall then be glad to set about one of those little fellows. Meantime will you kindly furnish me information on the following prints. ## 1st Is it required to drive two dynamos from one engine according to your system on land? ## 2nd What is the size of the dynamos, and the speed, and power required? ## 3rd Would a coupling be required by which either dynamos (if two) could be disengaged readily, or is a rigid connection prepared? ## 4th Is the engine liable to become magnetized?"





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