On a New Formula of the Ascending Velocity of the Pilot-balloon

Abstract

From July, 1932 to August 1933 the double pilot-balloon observations were made at the Haneda branch station of the Central Meteorological Observatory located in the compound of the Tokyo Air-port. By using the observed data we determined an empirical formula of the ascending velocity of the pilot-balloon, which is as follows: in which the velocity of the pilot-balloon ascent V is expressed in meters per minute, the lift L and the pilot-balloon weight W in grams, and the observed air temperature t before the filling up of balloon with the hydrogen gas in Centigrade. This formula is valid for the weights of the pilot-balloon from 10 gms to 70 gms. The characteristic of the new formula exists in the factor varying with the temperature.
It is also shown that the new formula can also be derived by theoretical consideration. The author gives tables of lift for given ascending velocity and weight of the balloon. He also calculated the order of unavoidable errors arising from the observation.