Description | 1. 'Calculation of angles in space from measurements of track photographs. Theory. Lees' method'. 9pp written on verso of petrol claim forms in another hand.
2. 'Measurements of alph-track photographs and Calculations of the angles of a fork. Blackett's method'. 4pp in another hand.
3. 'Geometrical Theory' manuscript draft, 10pp in Blackett's hand. |