The longer diagonals being parallel to the plane of projection will be of their original dimension. ... Two lines are thus obtained in the required relation, and if the scale of the drawing be set off along the line Ar/ 3, and perpendiculars droppedanbsp;...
|Title||:||Instruction in fortification, military engineering, and geometrical drawing at the Royal military academy, Woolwich|
|Author||:||Woolwich roy. military acad|