[LB015083], Letter from Thomas Alva Edison to Charles Batchelor, December 28th, 1882


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[LB015083], Letter from Thomas Alva Edison to Charles Batchelor, December 28th, 1882

Editor's Notes

Referring to your letter of 1st inst I think the expolsion you refer to is due to arcing. we have fixed the wires in the "inside part" by using insulated wires. I will speak to Upton about the [var----] & see that the necessary change is made There must have been some change in your carbonization to bring volts down as Upton cannot see how a drop of two volts could take place in the wet plaster as the [forces] would be sufficient to eat the cover off in a few days.##I have just got a new compound that I think will be good for sockets of Lamps. I have [not] however tried it for this purpose yet I am using it to stick mica together and it works splendidly. we roughen the mica pieces with sandpaper then punch a few holes in each piece, cover the mica thinly with the compound and so build up anything we want.##Bergmann is going to experiment with the compound to see if he cannot mould the socket thus displacing wood It is composed of common oxide of magnesia mixed with saturated solution of Chloride of magnesia. There may be several times its own bulk of [[----] [-----] [mould] with it such as finely powdered sand, [em---y] &c. It set in twelve hours harder than marble. I enclose sample [---y] says a sample made with 10 cubic cent of chloride magnesia Solution, 10 grammes of oxide magnesia.##You can experiment on propose amount of oxide & chloride.





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