The Belgian International Balloon Service

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    THE investigation of the higher regions of the atmosphere by means of unmanned balloons, which has been carried on by some countries for several years, generally on the first Thursday in each month, has already revealed some important facts, among which may be mentioned the inversion of temperature at various heights and the determination of the direction of the flow of the upper air-currents over land and sea. The success hitherto attained well repays the expenditure of time and money incurred, and gives good reason for hoping that the study of aggregate results may lead to the ultimate solution of the problem of the general circulation of the atmosphere.

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