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 38
ess than qo°, and in the case of the sum being equal to 90the traces for the plane will run parallel to the XV line. PROJECTIOXS OF PL.VNE FIGURE.S, IXVOLVIXO TflE COMPOFXI) AXGLE Section 10. Illustration may now be given of the application of the com-pound angle problem to cases of plane figures… … Fig. 26, Fig. 27. of the second line, will be perpendicular to the projection of the first Une. Con-versel}-, if one of them has to be inclined to the planes of projection, the arrange-ment of the other must follow it at right angles to the projection of the first, onthe plane to which the second…
Geometry, Descriptive
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