Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 64
f primary divisions, one of which is divided into tenths, and subdivided intohundredths by diago-nal lines (Fig. 146).This scale is con-structed in the follow-ing manner : Elevenparallel horizontal linesare ruled, inclosing tenequal spaces ; from oneend set off the primaryunit divisions, 0, 1, 2,… … Fig. 146. 48 DRAWma INSTRUMENTS. by a diagonal, and draw lines parallel to it through the other subdivisions. Totake a measurement of, say, 168, we place one foot of the dividers on the pri-mary 1, and carry it down to parallel 8, and then extend the other foot to theintersection of the diagonal…
Mechanical drawing
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