Mechanical laboratory methods; the testing of instruments and machines in the mechanical engineering laboratory and in practice (1922)
Smallwood, Julian Chase · New York, D. Van Nostrand company · leaf 93
1-2-1 the record wheel follows in a certainpath and, through contact with thesurface upon which it bears, is givena motion partly rolling and partlysliding. The principle upon whichthe instrument depends is that theytheifh \ Ji^li^ rolling motion of the wheel is directly proportional to the area… … 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 zero TTCk*circle maybe…
Mechanical engineering
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