~ 1940 RAF Aviation Navigation Course And Airspeed Calculator ~
The reverse has the air ministry crown and “A.M” and a stores reference of 6B/125.
It was made by H.T.A (1928) Ltd. and is of metal construction with a clear sliding section. The piece is marked with scales for airspeed, drift and distance etc. and was used by navigators to calculate flight routes.
~ Condition ~
There is general wear. It appears complete.
~ Dimensions ~
The main board is 10 cm (4 inches) wide by 20 cm (8 inches) long. It weighs 0.645 Kg.
