[The following note describes a series of notebooks that were not selected. For that reason, a "no Documents found" message will appear if the "List Documents" button at the bottom of the note is used. To see the records in the selected notebooks, use the "Which Series Notes?" button to enter the Series Notes.]
These seven books were used during August-December 1917 by Archie D. Hoffman and an unidentified assistant for statistical records of numbered "E" experiments. Each experiment usually involved a set of printings of a disc. For each printing, there is information about the number of records inspected, the number and percentage of "O.K." records, and the problems with each discarded disc. The reasons given for discard include pull-outs, crushed edges, cracks, and rough spots. Some of the results in these books were transferred to books in Notebooks by Edison and Other Experimenters -- Disc Record Books, Nos. 1-26.