This notebook covers the periods May-July 1885 and January 1886. Most of the entries are by Montgomery Waddell. There are also a few entries by Edison. The book contains the results of tests by Waddell on secondary batteries for miners\' lamps, along with drawings by Edison of electric power distribution systems. The spine is labeled \"24.\"" There are 308 numbered pages.
Blank pages: 232-235, 266-308."