The theory and practice of surveying. Designed for the use of surveyors and engineers generally, but especially for the use of students in engineering (1886)
Johnson, J. B. (John Butler), 1850-1902 · New York, J. Wiley & sons · leaf 447
diagonals.Fig. 115 shows an extreme case where the centre height ishigher than the side height at one end and lower at the other.Only the left half of the prismoid is shown in the figure. The 4i6 SURVEYING. cutting plane cuts the centre and side lines and the two diago-nals in efgh on the plane,… … \aiiC\) Fig. 115. v^icnient of that surface. It remains to show that efhg is aparallelogram. Since the cutting plane is parallel to the end planes all thelines cut are divided proportionally. That is, if the cuttingplane is one n^^ of / from c^, then it cuts off one z^ of all thelines cut, measured…
Surveying
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