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These three books were used by William Walter Dinwiddie in 1915, 1918, and 1920 for notes on miscellaneous experiments, some loosely related to the "D" experiments in the Dinwiddie Disc Books, to improve the molding of blank disc records. Included are experiments with varied ingredients for the wax and various tests on those waxes. The results often note how the wax melted and how well it loosened from the disc blank mold without melting. Other entries pertain to experiments with the powder in disc composition and its effects on the molds, as well as with various methods of loading the molds. Also included are notes on experiments to reduce wear on the molds and to protect them from excessive pressure from the hard blanks in the mold presses. The problem was eventually resolved by pre-softening the blanks within the presses with steam heat before physical pressure was applied.