. Scientific American Volume 64 numero 08 (Febbraio 1891). D nome. Im-agine un cappello con il numero 2 fissato sopra, come cappello di un coscritto. Per il No. 3 ci suposechair. Immaginate una sedia dotata di un numeromostrante il suo prezzo come indicato dal commerciante, ecc. allora ricorderete facilmente la successione degli oggetti eil numero del loro ordine e sarete in grado di nominarli in ogni modo possibile. Procedere in questo mannerup a dieci, e poi il giorno successivo fino a dodici, e presto, aumentando gradualmente il numero. Dopo un fewreitions di questo esercizio, sarete stupiti atthe facilità con cui yo

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. Scientific American Volume 64 Number 08 (February 1891) . d name. Im-agine a hat with the number 2 fixed above, as uponthe hat of a conscript. For No. 3 let us supposechair. Imagine a chair provided with a numbershowing its price as marked by the dealer, etc. Youwill then easily recall the succession of the objects andthe number of their order and will be able to namethem in every way possible. Proceed in this mannerup to ten, and then the next day up to twelve, and soon, gradually increasing the number. After a fewrepetitions of this exercise, you will be astonished atthe ease with which you will succeed in retainingtwenty or more words, absolutely classified in yourmind as if on drawing paper, so that when you areasked the number the name will come to your mind, and reciprocally. This is a pleasing diversion forfamily reunions on long winter evenings.—M. Alber, prestidigitator, in La Nature. CENTRIFUGAL ACTION OF AIR. BT SIO. II. HOPKINI. That air has sufficient mass to enable it when set inmotion to do work is shown by every whirlwind, by. Fig. l.-THE SKELETON SPHERE. & the action of the windmill, by the sailing of vessels, andin other ways. The grandest example of the centri-fugal action of air is furnished by some of the move-ments of the entire atmospheric envelope of the earth ;the upward currents at and in the vicinity of theequator, the downward movement of the air at thepoles, and the winds blowing along the earths surfacefrom the poles toward the equator are due in part atleast to centrifugal force. Any body revolving in airfurnishes a partial illustration of this principle, the de-fect in the illustration being the absence of a force to

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• bookcentury1800
• bookdecade1890
• booksubj
• booksubjectyellowfever