This notebook covers the period June-August 1880. The name of George H. Hill appears on the cover. Hill's name and Edison's initials also appear on page one. There is no other indication of authorship. The book contains a record of tests on experimental lamps, numbers 1175 to 1505. The cover is labeled "Lamps on pump," "July 25, 1880," and "George H Hill." The book contains 284 numbered pages.
The following pages contain skeleton tables that were never filled in (not selected): 8-25, 28-39, 48-49, 52-53, 154-177.
Blank pages: 178-281. Courtesy of Thomas Edison National Historical Park.