[The following note covers all the notes and drawings for 1879-1886.]
The Unbound Notes and Drawings are miscellaneous loose pieces of paper containing technical notes and drawings made between 1879 and 1886. Most of the documents are by Edison. There is also material by Charles Batchelor, John F. Ott, and other laboratory assistants. The documents relate primarily to electric lighting. Other topics include telephony, telegraphy, and electric railways. The notes and drawings appear in chronological order. Courtesy of Thomas Edison National Historical Park.