[D8818ASA], Letter from Charles Batchelor to John Kruesi, Edison Machine Works, August 27th, 1888


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[D8818ASA], Letter from Charles Batchelor to John Kruesi, Edison Machine Works, August 27th, 1888

Editor's Notes

New name mention: Philips. The samples of wire that I covered at Schenactady with your squirter are very fine, although the material itself is not quite tough enough. We find it difficult to wind it around a drum which did not in any way deteriorate it in any way except when one convolution bore down heavily on another one, then it would tear off the insulation, showing its want of toughness. Now I am, of course, experimenting more to give you that necessary toughness, but I have been thinking whether Philips could not wind that on a large drum, taking care that one convolution was not crossed, over another, and when one layer is made covering the whole spool with a piece of paper, so as to commence a new layer. I think with care like this the necessary covering could be put on and kept perfect until the braiding is done. Another thing I would like to suggest is that whilst the speed of the squirter is far too great for covering the wire immediately afterwards, still I think that some sort of covering could be put on immediately after leaving the squirter, for instance; the twisting spool could be so arranged that at every turn it would take in an inch in the length of the wire, and sufficient of them put there so that it would be practically a complete covering. [---] is can be a very light covering and could hold the installation thoroughly until you could put the finishing coat on. It is quite likely that if a single twisting was put on wire immediately after it leaves the squirter, say about a quarter of an inch apart and lightly, that it would hold the insullation there and help to keep it from being torn off when one wire crosses over the other. Insull tells me that you thought you noticed some acid in the compound, this is quite likely but it must be a small amoung. In our process we wash out the acid with warm water, and we generally wash it out until these is no more taste. I have 2 or 3 cans ready to send up to you. In the mean time please let me know what you think of the above suggestions.





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