The illustrated architectural, engineering, & mechanical drawing-book : for the use of schools, students, and artisans ; upwards of 300 illustrations (1856)
Burn, Robert Scott · London : Ward and Lock, 158 Fleet Street · leaf 124
fig. Id … described from the centre d ; the circle in is divided into as many equalparts as there are arms in the wheel, any central point of these, as m,being adopted as the datum-point from which to take the measurements.The space between any two of these arras, as a l>, is bisected, and a line, 122…
Architectural drawing · Mechanical drawing
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