[LB004457], Letter from Charles Batchelor to Edward Hibberd Johnson, July 9th, 1879


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[LB004457], Letter from Charles Batchelor to Edward Hibberd Johnson, July 9th, 1879

Editor's Notes

We send you today the following: 12 complete telephones 12 extra chalks 1 switchboard etc 12 call battereis The 12 extra chalks are made of chalk and phosphate of Soda, and must not be we by dipping; but by dipping a piece of paper in the solution and letting it soak into the chalk from that. We find this chalk never actually needs a second wetting, as we have left one out to dry seven days and it was just as loud at the end of that time. They take a magnificent polish and of course do not appear to wear away at all. The solution we wet this chalk at first with is a saturated soluiton of Phosphate of Soda. This letter is not official information for the company but private information for ourself, Carman will always notify the company of any shipments but alterations in chalks such as described he knows nothing about of course. You will not find the phosphate of soda quite so loud as the other at first but far superior in the fact that it needs no wetting and is always good.





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