New York [etc.] Simmons-Boardman Pub. Co. [etc.] · leaf 41
he var-nished zinc disc D, this disk being mounted on ashaft which is driven by clockwork. A piece of india-rubber coiled on the shaft of the disc with a slighttension compensates for the slight variations of re-sistance to which the clockwork is subjected in con-sequence of the friction of the… … design No. 2. Tbe speed of the disc being constant,the distances between the kilometer marks on themargin afford an indication of the speeds at whichthe different parts of the run were made. In thelower record, produced by design No. 1 the upperline gives the record made by the deflections of…
Railroads · Railroad cars
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