Altimeter, Aviation Section US Signal Corps, 15,000FT, WWI Czech with a maximum ceiling of

with a maximum ceiling of 20

when combined with the APA-44 computer

It has a service date stamp of 2-59

This offer is for a vintage 1950s Cabin Pressurization Rate of Change Selector made by Airesearch

Imagine you are a 22 yr old Soviet artillery officer under pressure from your Soviet General (with the political officer looking over your shoulder) while trying to use this device to determine critical mathematical calculations and avoid the consequences of friendly fire on your front-line comrades (not that the political officer cared about that)

Altimeter, Aviation Section US Signal Corps, 15,000FT, WWI Czech with a maximum ceiling ofThis is an Altimeter used in military aircraft of the Aviation Section, US Signal Corps, which existed from 1914 1918 and was the WWI era precursor to today's US Air Force. This altimeter crudely measured altitude from 0 15,000 ft. By loosening the small retaining lever, gripping the knurled rim of the faceplate and turning, the numerical scale rotates clockwise or counter clockwise while the pointer remains stationary, to correct the altitude reading