Altimeter in Display Case, Aviation Section US Signal Corps, 15,000FT, WWI OH-6 Cayuse As the engine speed increased

As the engine speed increased

The indicator would have required the separate lamp module (Fl26682 & 27003

and a taller tail fin

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

It red lines at 110degC

Altimeter in Display Case, Aviation Section US Signal Corps, 15,000FT, WWI OH-6 Cayuse As the engine speed increasedThis 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