Aircraft Bubble Sextant Type MA-2 Commemorative Display F6F Hellcat displayed the performance of 3

displayed the performance of 3 engine parameters in one instrument: Oil Temperature

Some pencil markings

Computer measures ~5

Here is a Type C Altimeter used in early military aircraft of the US Army Air Service during WWI

This is an original WW-II-era Familiarization Manual for the US Army Air Force heavy bomber Boeing B-17F Flying Fortress

Aircraft Bubble Sextant Type MA-2 Commemorative Display F6F Hellcat displayed the performance of 3This is an Aircraft Bubble Sextant Type MA 2 elegantly mounted on a hefty wooden base with brass plaques dedicated to its recipient, pilot Colonel Melvin P. Clark, by appreciative navigators of the 323rd Flying Training Wing at Mather Air Force Base near Sacramento CA in 1978, where he was base commander. The sextant, made in 1957, swivels on the wooden base to permit viewing of all angles. The knobs on the sextant turn, but its operating condition is