Practical plane and solid geometry for advanced students, including graphic statics, adapted to the requirements of the South Kensington syllabus (1899)
Harrison, Joseph, Baxandall, George Albert · London Macmillan · leaf 500
which it is always at right angles. Atthe same time it moves along the axis a distance of 1 | for everycomplete revolution, thus generating a helical surface. Make asection of this surface by a plane parallel to and J from the fixedaxis, the section to show two revolutions of the surface. (18S9)… … IV3 i0h*& - ^ ~~7u Co \o e °r-7 Xb* (e) a/ \o U CI e <0 °p