Fry, Horace Pugh. [from old catalog] · Philadelphia · leaf 14
planes. 11 9. Third angle projection gives the most logical and practicalviews; it is used universally in American practice and all drawingsare to be made accordingly unless otherwise directed. 10. In third angle projection the planes of projection arebetween the observer and the object. Let it be… … 5 C^/7 /30/7?6>/r/C Fig. 9. 11. Projection lines are lines drawn perpendicular frompoints of the object to the planes of projection. 12. The trace of a line is a point where the line, prolongedif necessary, cuts a plane. 13. The trace of a plane is a line where the plane, extendedif necessary,…
Mechanical drawing
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