Descriptive geometry for students in engineering science and architecture; a carefully graded course of instruction (1915)
Armstrong, Henry F. (Henry Fry), 1868- · New York, J. Wiley & sons, inc.; [etc., etc.] · leaf 16
Y X Fig. 4. … opposite this new arrangement of the plan in each case is set up. that the truelength db2 and cd2 respectively, is shown on the V.P., and the incUnation 0^, ofthe line, to the H.P. may now be seen; also, the line in each case must bearranged parallel to the H.P. by swinging its elevation parallel…
Geometry, Descriptive
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