[The first paragraph of this note covers all of the Unbound Notes and Drawings for Part I.]

The loose technical notes and drawings constituting this collection cover the years 1873-1878. They relate to a variety of subjects, including telegraphy, electric lighting and power, the electric pen and duplicating press, the telephone, and the phonograph. There are also documents pertaining to various other subjects, such as carbon rheostats, acoustic devices, the tasimeter, and the voltameter. The unbound notes and drawings are organized by year and within each year by subject. Undated notes and drawings, organized by subject, follow the dated material.

This folder contains more than 100 pages of notes, along with a few drawings, relating to chemicals and chemical experiments. Included are fragments of caveats or patent applications and numerous lists of chemicals. Many of the items are in Edison\'s hand.

Several additional documents (images 69-75, 95-105) were discovered after the microfilm edition of Thomas A. Edison Papers, Part I (1850-1878) was published and were filmed in the Supplement Series of Thomas A. Edison Papers, Part III (1887-1898).

The following notes and drawings were published in The Papers of Thomas A. Edison, Vol. 2:\n\n

1. Doc. 368: images 4-11
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2. Doc. 410: images 29-31