50,000 to 100,000 feet, marked each 1000 feet.
100,000 to 150,000 feet, marked each 10,000 feet.
150,000 to 200,000 feet, no intermediate marking.
A-1 barometer computing correction mechanism
(3) You should realize that you have adjusted the barometer scales for a
reading at one of the altitudes in the preceding list. For the greatest accuracy,
correct the vernier slide setting using the calibration chart on the front of the
mounting platform (Figure 16).
are proper as indicated and should be used when converting the observed reading to
true pressure values.