Altimeter in Display Case, Aviation Section US Signal Corps, 15,000FT, WWI OH-6 Cayuse This Airspeed Indicator is a

This Airspeed Indicator is a WWII-era US Army Air Force Type D-7

Reference Number 41-7952

As the engine speed increased

to Military-Extended

Altimeter in Display Case, Aviation Section US Signal Corps, 15,000FT, WWI OH-6 Cayuse This Airspeed Indicator is aThis 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