Sextant, Aircraft Periscopic, MS28011-5, with Case, for Display, Parts, or Repair Bf-109 Here is a student workbook

Here is a student workbook that helped cadets understand the functions of aircraft

and Bell UH-1 and AH-1 Cobra Helicopters per their maintenance manuals

This example came to us from an estate claiming that it was from a Curtiss JN Jenny Biplane

per its additional label

25 inches diameter and ~7 inches deep

Sextant, Aircraft Periscopic, MS28011-5, with Case, for Display, Parts, or Repair Bf-109 Here is a student workbookThis is a Cold War era Periscopic Aircraft Sextant and Case, as used by navigators in aircraft of the US Air Force such as B 36 Peacemaker, B 47 Stratojet, B 50 Superfortress, B 52 Stratofortress, C 130 Hercules, and of the US Navy such as the P2V Neptune and others. This example has a serial # prefix of AF 53, manufactured under a USAF purchase order issued in 1953. The periscopic sextant was used by navigators to fix and track the position of the