Altimeter, Air Section US Signal Corps, 15,000FT, WWI B-52 Here is a Mach Speed

Here is a Mach Speed Indicator

the difference between the totals is the difference in density of the two fuel types

Here is an aerial refueling nozzle

25" square mount and 4" deep

Altimeter, Air Section US Signal Corps, 15,000FT, WWI B-52 Here is a Mach SpeedThis 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