. American engineer and railroad journal . ng secret of national defense. 474 THE AMERICAN ENGINEER [October, 1893. Wc see HOW how Messr-i. Reiiiivd iwul Kiebs have obtainedsuch results. We have been guided in our work, the_v sa_vin a note to the Academy of science. by tlie sluily aiui workof Mr. Dupuv de Lime, in regard to tlic construitioii of liisballoon in Ibe years of loTO an;l 1872, and furtlienuore. wehave underlakcM to fnllil llie followini; conililions in additionto wbat he his done ; stability of roule was ol>lained by theform of tbe balloon and the ananuiement of llie ruddi^. Dim
. American engineer and railroad journal . ng secret of national defense. 474 THE AMERICAN ENGINEER [October, 1893. Wc see HOW how Messr-i. Reiiiivd iwul Kiebs have obtainedsuch results. We have been guided in our work, the_v sa_vin a note to the Academy of science. by tlie sluily aiui workof Mr. Dupuv de Lime, in regard to tlic construitioii of liisballoon in Ibe years of loTO an;l 1872, and furtlienuore. wehave underlakcM to fnllil llie followini; conililions in additionto wbat he his done ; stability of roule was ol>lained by theform of tbe balloon and the ananuiement of llie ruddi^. Dim-inution of resistance to progress by the clioice of dinunsions ;the centers of Iraclion .and resistance were brouulit together inorder to diminisb the luovcment which tends to dislurl) thevertical stability. Finally, the speeil was ol)laincd which wascapable of resisting the winds which prevail for about three-quarters of tbe lime in our country I shall as rapidlyas possible the means which were emploved to realize Fio. 12. lAnhtaeHit of Motiir.—Wvi motor of 1884 was a (Jramtnemachine which Commandant Krebs knew combined a light-ness hitherto unkmwn ; it had a i)ower of about %\ , andonlv weighed .T lbs. The motor which it replaced, andwhich was designed witli the assistance of (Jraiiune, gave 9II. I*, with the same weight. The electric generator was a battery designed as a result ofthe researches of Commiinilant Uenaid. The hydraulic reser-voir live tinu-s as much liquid as in the batteries ofbi-chromale was attached to the , and provided wilh aswitch which permitted them to obtaineither a slroni; currentof short duration or a weak current of long duration. has shown that it was advanbigeous to place theseswitches so that about \\ volts below the maximum are obtainable. The great total cnergv of the Kenanl battery is dueprincipally to the subslilution of chromic acid for thebi-chro-mate, whose alkaline base
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
