As this set of observations indicates a fall of .07 in the interval between the base and summit readings, it becomes necessary to make another correction to the last column.
Correcting the first reading to accord with the fall indicated by the stationary barometer, we get after all corrections:
| Fryeburg, | 29.39 |
| Mt. Kiarsarge, | 26.51 |
The logarithmic formula for estimating heights from barometric observations is
in which
| D | = | difference in altitude in feet. |
| B | = | height of barometer in inches at lower station. |
| b | = | height of barometer in inches at upper station. |
| T and t are the temperatures of the air in Fahrenheit degrees. | ||
Applying this formula to our first example we have:
The second example gives: