A practical treatise on modern gas and oil engines (1902)
Grover, Frederick · Manchester, The Technical Publishing Co., Limited; [etc., etc.] · leaf 178
by the point, butthis time in a contra-clockwise direction, following thedotted outline, fig. 96. When the point returns again to Athe hatchet will have travelled back towards X, say to Xi.The mean side movement of the hatchet end gives at oncv.the average height of the diagram. Thus, suppose… … ila. 90. The ordinary hatchet planimeter was invented by CaptainPrytz, of Copenhagen, but its use involved calculations far tootedious for practical men. Professor Coodman has embodiedthese calculations on a scale marked upon his hatchet plani-meter, which enables an area to be measured by reading…
Internal combustion engines
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