This notebook covers the period September-October 1880. Most of the entries are by Francis Jehl. There are also occasional entries by Francis Upton. Many of the entries are initialed by Edison. The book contains notes and tables of tests relating to the first lot of lamps (numbers 1-100), which was sent from the lamp factory to the laboratory for testing. There is also a copy of a note from Batchelor to Upton concerning these lamps and a list, prepared later, of lamps sent. The label on the front cover is marked "Factory," "Jehl," "Oct 1880," and "Lot I Lamps." There is an index on the inside front cover. The book contains 284 numbered pages.

Blank pages: 272-275, 280-281.