Mechanical drawing. Elementary and advanced (1910)
Reid, John S. (John Simpson), 1856- · New York, J. Wiley & sons; [etc, etc.] · leaf 102
6/ erect pers. to the points 61*5,*41*31* and 2* ORTHOGRAPHIC PROJECTION. 87 and join them with straight lines. These are the projs. inthe first position. Now trace the hor. proj, 1*, 2/, etc., ona piece of celluloid or tracing-paper and revolve the tracinguntil the diagonal 1*2,* makes an angle of… … straight lines, and so complete the projections of the secondposition, Fig. 122. PROB. 11, FIGS. 123 AND 124.—Draw the projs. of a cir-cular plane (1) when its surface is par. to the vert, plane, (2)when it makes an angle of 45 ° with the V.P., and (3) whenstill making an angle of 450 with the V.P.…
![An illustration from Divina proportione : opera a tutti glingegni perspicaci e curiosi necessaria oue ciascun studioso di philosophia: prospettiua pictura sculptura: architectura: musica: e altre mathematice: suavissima: sotile: e admirabile doctrina consequira: e delecterassi: co[n] varie questione de secretissima scientia (1509)](https://img.insideoutlibrary.com/img/200/ia-divinaproportion00paci-132-364.webp)
