Handbook of Artillery Instruments and Rage-Finders. Part I. Section 16, Indicator, Time of Flight, Mark IV Directions for the use of artillery instruments. Pamphlet no.3. The Slide Rule, 1937. WO 7332 Handbook of Artillery Instruments and Rage-Finders. Part I. Section 14. Calculator, Ballistic Correction, no.1, Mark I. 1933
