Altimeter, Air Section US Signal Corps, 15,000FT, WWI B-52 which altered the angle of

which altered the angle of the projected light) to transmit Morse code

and the smallest pointer is just peaking from behind the 1000's pointer

Here is a Mach Speed Indicator

25" square mount and 4" deep

Handwritten overhaul markings are on the back

Altimeter, Air Section US Signal Corps, 15,000FT, WWI B-52 which altered the angle 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. Made by Taylor Instruments, item # 2081 A. 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