Physical description

Rectangular calculating instrument with (1) 'hinged lid' fitted with circular rotating dial for setting/reading altitude, speed, distance and temperature, (2) notebook inside lid, (3) circular dial with perspex cover, beneath which is (4) graph chart, moveable up-and-down by means of rotating knob on side of device. Curved brackets and elasticized straps on back for strapping onto pilot's leg.

Inscriptions & markings

R.A.A.F. Ident. No. G6B/145
Serial No. WG/2233
COMPUTER NAVIGATIONAL
Mk. III D.
(Other inscriptions including instructions for use and scales for various measurements)
"AB" hand written on strap (owner's initials?)

References