pattern, experiment was published in L'Aerophile, Vol. 1, by mann's balloons were provided with a valve, which W. de Ponvielle. which is more nearly constant in action than the mul- ;was opened by the expansion of the balloon when it tiple-cell aneroid, though perhaps more liable to de- Until the… … If Not Found until After NOVEMBER 4th, return the..oHier..card. Courses of two ballons sondes liberated at Washington University, St. Louis. Small circles in the lines indicate times at which observations of altitude and azimuth were made. . Figures show Card returned by finder of balloon sent up…
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