This notebook covers the period April-May 1886. All of the entries are by Edison. Many of them concern the direct conversion of heat into electricity, the lines of force of the earth around the sun, and atomic and molecular structure. Included also are notes and drawings relating to armature windings and connections, the phonoplex, the grasshopper telegraph, the tasimeter, electric railways, an Archimedean screw to propel a steamer, the manufacture of silk, and the separation of butter, cream, and water from milk. The spine is labeled "28." The book contains 286 numbered pages.
Blank pages: 42-43, 92-99, 214-215, 242-243, 276-286.
Missing page numbers: 17-18, 263-264. Courtesy of Thomas Edison National Historical Park.