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Image from page 635 of “Review of reviews and world’s work” (1890)
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Identifier: reviewofreviewsw33newy
Title: Review of reviews and world’s work
Year: 1890 (1890s)
Authors:
Subjects:
Publisher: New York Review of Reviews Corp
Contributing Library: Robarts – University of Toronto
Digitizing Sponsor: University of Toronto
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in thecourse of the sailing. After a careful study ofthe records made by Nansen of the velocity ofwinds in the same region to be traversed by theairship, Mr. Wellman has come to the conclu-sion that if his ship has a proper speed of fromnine to seventeen geographical miles per hour itwill be able to cope with approximately eleven-twelfths.—certainly four-fifths,—of all the windsthat blow over the Arctic Ocean in July andAugust. AVith unfavorable winds of higher velocities,it is planned to stop the motors and throw outupon the ice-sheet over which the ship is sailinga dragging-anchor, or retardateur, a device cal-culated to offer the maximum of resistance inproportion to its weight, and by this means todrift slowly with the adverse wind. Thus, theoccurrence of contrary winds of velocities greaterthan the airsliips motor speed should not be re-garded as a loss to be deducted at full valuefrom the progress of the airship, because the in-fluence of such winds is largely neutralized by
Text Appearing After Image:
TnE AVELLMAN POLAH AIRSHIP. (lieiitlli of biillooii, UU.04 feet; greatest diameter, 52.49 feet; volume, 224,244 cubic feet.) LEADING ARTICLES OF THE MONTH. 628 the action of tlie dragging-anchor. It is not in-tended to make firm anchorage, save in cahns,and then only for special purposes, such as scien-tific observations. With a wind of from ten totwelve miles per hour, the airship would remainapproximately stationary in the air, perhapsdrifting half a mile or a mile per hour. In awind of fifteen miles per hour, it would driftabout three miles with it. In a wind of twentymiles per hour, the driftage would be eight milesper hour. Should the wind rise to thirty milesper hour, the driftage would be about eighteenmiles per hour. Thus, in the higher winds theship would lose way according to tlie velocity, butin no case would there be incurred risks of ruptureof the apparatTis by having it subjected to strainsgreater than it would be able to withstand. Making allowance for retardation by th
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