This notebook dates from December 1878. All of the entries are by Edison and relate to work on the electric light. There are notes on carbon, platinum, and other materials; calculations and notes on gas, including comparisons of calculations made by Moses Farmer and Edison; notes and drawings relating to electric power distribution and the need for high resistance lamps; and drawings of lamps and generators. The label on the front cover is marked \"short notes -phrases\"" [crossed out]. The book contains 59 numbered pages.

Blank pages: 55-59.\n\n

Several pages from this notebook and from Notebook #9 (N-78-12-15.1) were published as Doc. 1621 in The Papers of Thomas A. Edison, Vol. 4. The images appear in the following order: Notebook #9, pages 3-13; Notebook #192, pages 23-39."