The navigational computer was a circular slide rule used for calculating height and air speed corrections when flying an aircraft. The front cover lifts to reveal a further calculator used to solve vector triangles and plot course alterations. The device was intended to be strapped to a pilot's leg. The instrument was made by White and Gillespie (Melbourne) Pty Ltd c 1940 for the RAAF and used during WW2.Black metal box with silver metal flap top cover affixed with rotating circular rule . Two adjustable belts are affixed to the base of black box. A small spiral bound note book is contained beneath the flap top. RAAF Computer Navigational system MK. III. D. Serial No WG 2833navigation, raaf, computer, aircraft, ww2, 1940

Used by RAF and RAAF during WWII Believed to have been used in the battle of britainMetal faced bakelite box with rotating dial on front and a paper graph sheet enclosed in front cover a pencil for plotting course and position is attached to the side of the unitNavigational Computer ICANican computer, battle of britian computer, aircraft computer, mechanical computer

Used by RAF during WWIIMetal calculator with rotating metal dial and slide scalewith additional rotating ial on revrseCalculateur D'Estime A.A.F. Type 40navigation computer, aircraft computer, air force course computer,

RAAF Manual navigation aircraft calculator(early computer)General issue to allied pilots and navigators for airspeed,altitude,air temperature and drift calculations.Black metal box with SS flap-top cover, moulding and straps for knee attachment.Engraving No. 19, Ident.No. G6B/145. I.C.A.N. Serial No. WG/1716*. Computer Navigational Mk.IIID

Item used by Navigators or Pilots of small aircraft. Belonged to Maxwell Lennox MATHESON 418447 RAAF. Refer Cat No1959 for his service history.NAVIGATIONAL Computer Mark III.D, metal - bakelite, construction rectangular box shape, top lid hinges open. Top lid has a circular adjustment. Inside has another circular adjustment. Centre is a graph in red which winds by a dial on side. Inside top lid hand written in black are items of Navigation."NAVIGATIONAL Computer MKIID REF No 68/180 ICAN CALIBRATION"electrical technology, appliances & accessories, navigational

Index, bib, ill, maps, p.888.non-fictionThe 20th century is the century of communism and fascism, of debt and prosperity, of the United Nations and nationalistic fervour, of mass demonstrations and individual defiance; and also of the aircraft and the submarine, of the conveyor belt and the computer, of miracle cures and new diseases, and of radio and television. history - modern - 20th century, history - modern - 21st century

Standard crew issue for pilots and flight engineers.The equipment supplied air crew with a computer to calculate individual aircraft's weight and balance.2 Circular plastic manual computing discs with black print on a white background with areas for calculating Centre of gravity, Armament, Bomb loadings,Fuel, oil,Crew, Miscel., Oxygen and Camera. Clear plastic protractor with string attached. Enclosed in a leather envelope.GRAVISCOPE FOR LIBERATOR. MODEL B24J, L AND M. MANUFACTURED BY MELB. >W&G< AUST. R.A.A.F IDENT NO G6B/2396

WWII Historical significanceRAAF Navigational computer MK111 D used in WW11 in aircraft for plotting direction and wind speed with original box.Identification number G6B/145. Serial No WG/2677*. Contains original pencil from 1940 and navigational notebook.