Correspondence between George Phelps and Thomas Edison
Documents with permission of the Thomas A. Edison Papers- Rutgers University
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In the document below, Phelps is responding to a request by Edison for the status on glass disks. These disks were used in the construction of the Edison Carbon Telephone Transmitter. 
" T. A. Edison Esq Dear yours at hand, I have no glass disks yet. I will let you know when I find some good ones. Yours truly G M Phelps In September of 1877, Thomas Edison gave Western Union drawings of a telephone from which a patent model was to be constructed by George Phelps. In the telegram shown below, Phelps is asking Edison for clarification on one of his instructions. 
New York Sept.22 1877 Menlo Park T A Edison Drawings for model received. I understand an opening in end of reed is this correct? or the diaphram whole and attached ? or not to reed. G. M. Phelps |
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George M. Phelps