Aldis, W. Steadman (William Steadman), 1839-1928 · Cambridge [Eng.] Deighton, Bell, and co.; London, G. Bell and sons · leaf 161
ves the osculating plane, which iscalled the curvature of torsion. On this account curves inspace are called curves of double curvature. Before proceeding to the formulae relating to the twokinds of curvature at any point of a curve some geometricalexplanations and definitions must be given. Let… … 152 ON CURVES IN SPACE. Through p let a plane be drawn perpendicular to PQ andthrough q, r, s ... planes perpendicular to QR, RS, ST,...respectively. These will ultimately be normal planes to thecurve at consecutive points. Let the planes through p, qintersect in a line AE, and the planes through…
