Abstract
A USEFUL little treatise, easy to read and understand, and well illustrated. It has some defects. The error due to stretching of the cord is thought to be merely a cutting away of the two ends of the diagram, whereas the whole diagram is altered on account of the continuous change of length of the string as the pulling force alters through inertia of the paper barrel and friction. Again, friction of pencil on paper always keeps the diagram larger than it ought to be; the author says that it reduces the area. Too much space is devoted to the theory of the planimeter and other matters. The important relationship between natural period and time of revolution of engine is not touched upon.
The Steam-Engine Indicator.
By Cecil H. Peabody, Professor of Marine Engineering and Naval Architecture, Massachusetts Institute of Technology. Pp. 153. (New York: John Wiley and Sons. London: Chapman and Hall, Ltd., 1900.)
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The Steam-Engine Indicator . Nature 64, 125 (1901). https://doi.org/10.1038/064125c0
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DOI: https://doi.org/10.1038/064125c0