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63.

stations would doubtless be of great value in weather for^[[e]]casting. The method herein described is evidently well suited for such a purpose, in that the time of rise and fall would be short, so that the apparatus could easily be found on the return. Thus the expense would be slight; being simply that of a fresh magazine of cartridges for each day.

For this work, as well as for that previously described, the head of the rocket should be prevented from rotating, by means of a gyroscope, such as is explained in United States Patent, No. 1,102,653.

[[underlined]] CALCULATION OF MINIMUM MASS REQUIRED TO RAISE ONE POUND TO AN "INFINITE" ALTITUDE [[/underlined]].

From the fact that the preceding calculation leads us to conclude that such an extreme altitude as 2,310,000 ft. (over 437 miles) can be reached by the employment of a moderate mass, [[underlined]] provided the efficiency is high[[/underlined]], it becomes of interest to speculate as to whether or not a velocity as high as the "parabolic" velocity for the earth could be attained by an apparatus of reasonably small initial mass.

Theoretically, a mass projected from the surface of the earth with a velocity of 6.95 miles/sec. would, [[underlined]] neglecting air resistance [[/underlined]], reach an infinite distance, after an infinite time; or, in short, would never return. Such a projection without air resistance, is, of course, impossible. Moreover, the mass would not reach infinity but would come under the gravitational influence of some other heavenly body.

We may, however, consider the following conceivable case: