Intercept Officers Equipment Kit, Type I (Navigation Computer) 1943 Martin This is an Altimeter used

This is an Altimeter used in military aircraft of the US Navy either during or post WW1

As airspeed increased

with an interesting history

and of the axis nations

at USAF SBAMA (San Bernadino CA Air Materiel Area)

Intercept Officers Equipment Kit, Type I (Navigation Computer) 1943 Martin This is an Altimeter usedThis is a WWII era navigation computer in a kit "Intercept Officers Equipment Type I. This example includes two 2 piece USAAF Ground Speed Timer Calculators (for map scales 1: 250,000 and 1: 500,000) and 2 USAAF Rulers. The bottom of the metal case contains a mechanical computer to solve the wind problem. It has a locking mechanism and a movable arm for drift, adjusted for air speed, interconnected to the heading tracker. The lid contains tables and a