[D8959AEW], Letter from Hugh De Coursey Hamilton to Edison Phonograph Works, September 27th, 1889
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Title
[D8959AEW], Letter from Hugh De Coursey Hamilton to Edison Phonograph Works, September 27th, 1889
Editor's Notes
Defective Machines. Untrue Shafts. ### The report I have to make upon the two last motor Phonographs received prior to those shipped for Lisbon, is that in each the main shaft revolved untruly between its centres, one of them in particular was ver y bad; but both unfit to use except upon the original grams of white wax. ### The damage seemed at first to be in the female centre caused by the gate centre having thrown up a burr on the edge of the female centre, but I removed the burr without eradicating the fault. ### Battery. ### My test upon the 4 cell Edison Battery, after setting it up according to instructions, resulted in its driving a Phonograph at the rate of One hundred revolutions per minute for 40 consecutive hours. In endeavouring to recharge the cells I find in each jar at the bottom a precipate crystalized into a dense cale one inch thick which is almost impossible to remove.
Author
Recipient
Mentioned
Date
1889-09-27
Type
Folder/Volume ID
D8959-F
Microfilm ID
127:927
Document ID
D8959AEW
Publisher
Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University