Twentieth century handbook for steam engineers and electricians, with questions and answers; a practical nontechnical treatise .. (1916)
Swingle, Calvin F. (Calvin Franklin), b. 1846 · Chicago, F.J. Drake & company · leaf 556
pplying this method, especially withscales representing high pressures, as 60, 80, etc. The mostsonvenient and reliable method is to take a narrow stripof paper of sufficient length, and starting at one end, applyits edge to each ordinate in succession, and mark theirlengths on it consecutively,… … Fig. 210 expressed decimally, and divide by the number of ordinates.The quotient will be the average height of the diagram, andas the scale expresses the number of pounds pressure foreach inch, or fraction of an inch in height, if the averageheight of the diagram be multiplied by the number of…
