Rogers' drawing and design; an educational treatise relating to linear drawing; machine design; working drawings; transmission methods; steam, electrical and metal working machines and parts; lathes; boiler and parts; instruments and their use; tables, etc (1913)
Hawkins, N. (Nehemiah), 1833- · New York, T. Audel · leaf 147
Fia. 2T7. The distance between the distance PF of anypoint in the hyperbola from one of the foci, and thedistance, PF, the distance of this point to the otherfocus, must always be equal to a given line. In the chapter on geometrical drawing severalmethods have been explained in which an ellipsemay…
Mechanical drawing · Machine design
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