This notebook covers the period May 1893-August 1895. It was used primarily by Joseph W. Harris for notes, calculations, and drawings from bricking experiments. The book reflects Edison's own involvement through marginalia in Edison's hand and notes by Harris regarding Edison's individual experiments. Among the more unusual experiments is a test to determine whether the bricks "could be used [as] a substitute for building and paving bricks." The front cover is labeled "Data on Bricking Iron Ore Concentrate" and "Bricking Data & Muck." The spine is labeled "Data of Later Bricking Work." The pages are unnumbered. Approximately 120 pages have been used. A one-page letter from Harris to Edison has been inserted into the book.