Mechanical laboratory methods; a testing of instruments and machines in the mechanical engineering laboratory and in practice (1918)
Smallwood, Julian Chase · New York, D. Van Nostrand company · leaf 97
heel follows in a certain-n^^ en er i^2ii\\ and, through contact with the surface upon which it bears, is givena motion partly rolling and partlysliding. The principle upon whichthe instrument depends is that the^hed- \ J^^^^ rolling motion of the wheel is directly proportional to the area circum-… … 14 PLANIMETERS 77 fixed center of the instrument is placed within the area, thussecuring a greater reach of the tracing point. (See Fig. 51.)In this case, the readings of the wheel must be interpreted dif-ferently and the constant known as thezero circle must be known. The zerocircle maybe defined…
Mechanical engineering laboratories
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