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48.

[[underline]] DIVISION OF THE ALTITUDE INTO INTERVALS [[/underline]]

In dividing the altitude into intervals the only condition that must be fulfilled is that the densities in any interval shall not differ widely from the mean value in the interval. The least number of intervals which satisfy this condition are given in the following table.

[[underline]] TABLE IV [[/underline]]

[[5 column table]]

Interval | Length of Interval | Height of upper end of Interval above sea-level | Mean density in terms of So | Mean gravity chosen, in terms of gravity at sea-level

s1 | 5,000 ft. | 5,000 ft. | 0.928 | 1
s2 | 10,000 | 15,000 | 0.730 | 1
s3 | 10,000 | 25,000 | 0.520 | 1
s4 | 20,000 | 45,000 | 0.278 | 1
s5 | 40,000 | 85,000 | 0.080 | 1
s6 | 40,000 | 125,000 | 0.015 | 1
s7 | 75,000 | 200,000 | 0.0026 | 1
s8 | 300,000 | 500,000 | 0.000025 | 1
s9 (a=150) | 3,415,000 | 3,915,000 |   | 0.839
s9 (a=50 | 8,810,000 | 9,310,000 |   | 0.684