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

Aircraft air speed indicator made by Pioneer Instrument Company which specialised in aeronautical instruments. Black painted cylindrical instrument with glass face . There is a side cutout containing metal parts . Air Speed Pioneerraaf, aircraft, airspeed indicator, ww2, pioneer instrument co

A kangling is a trumpet made out of a human thighbone, used in Tibetan Buddhism for various chöd rituals. The practitioner, motivated by compassion, plays the kangling as a gesture of fearlessness, to summon hungry spirits and demons so that she or he may satisfy their hunger and thereby relieve their sufferings. It is also played as a way of "cutting off of the ego." The hip end of the thigh bone is cut off, forming a nearly circular opening in the bone’s shaft, and it becomes the mouthpiece. The large flaring at the knee is left intact except for two gouged openings through which air and sound escape. The “bell” end of a kangling is usually covered with tightly sewn skin to ensure durability. Made out of a human thighbone, reinforced with leather. tibetan buddhism, musical instruments, ceremonies, ritual implements