This folder contains correspondence from inventors and others asking for Edison's advice on technical matters or his assistance in improving or promoting inventions. Among the documents for 1913 is a letter from Frank P. Hill, chief librarian of the Brooklyn Public Library, concerning books printed on materials other than paper, along with a letter from Isaac H. Blanchard & Co., Printers, regarding humidity control and elimination of static electricity in pressrooms. Also included is correspondence from Charles Edison and John Campbell of the Edison Electric Illuminating Co. of Boston pertaining to their investigation of junction box explosions and the possible use of Edison's odoroscope for measuring moisture and gases. In addition, there are occasional communications exchanged among Edison, his personal assistant William H. Meadowcroft, and employees such as William Walter Dinwiddie, Newman Henry Holland, and Harry T. Leeming.

A sample of the documents has been selected, including all items bearing substantive marginalia by Edison.