This notebook, which covers the period June-August 1888, is a continuation of N-88-06-06. It contains transcriptions by Arthur E. Kennelly of material from the rough record books used by experimenters in the Galvanometer Room. Included are notes, drawings, tables, and calculations regarding batteries, non-magnetic watches, photometers, condensers, electric meters, and electrocution experiments. Among the experimenters whose work appears in this book are F. P. Bergh, E. C. Boynton, Alex W. Brigham, and Johannes H. Cuntz. The front cover is labeled "Record Book No 4." The back cover is labeled "509." The spine is labeled "53." Attached to the inside back cover is an index. The book contains 89 numbered pages. Some pages were removed before the book was paginated.
The index appears first. Oversize graphs, formerly pasted onto pages 44, 50, 51, 60, 62, and 89, appear at the end of the book at a reduction ratio of 18:1. Courtesy of Thomas Edison National Historical Park.