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These seven books were used by William Walter Dinwiddie, Harry W. Doyle, Zachariah P. Halpin, and James W. Ramsay during 1911-1914. Included are experiments to ascertain the best carbon element for the "motion picture machine." There are also tests to determine the optimum relative positions of the kinetoscope and phonograph for synchronization. Some entries describe tests of the home projecting kinetoscope, including lighting, safety, and parts. There are also tests of various screens and films, as well as experiments with film developing machinery and formulas. One book (N-14-01-27.2) contains drawings of parts for a motion picture camera. The notes indicate that Adolph F. Gall, Charles W. Luhr, William O. Lyman, Elroy Pearsall, and an employee named Rowlands were doing similar work.