Items related to Letters of Euler on Different Subjects in Physics and...
Synopsis
Book may have numerous typos, missing text, images, or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1802. Not illustrated. Excerpt: ... LETTER II. Of Velocity. FLATTERING myfelf that your Highnefs may be pleafed to accept the continuation of my inftructions, a fpecimen of which I took the liberty of prefenting to you in a former letter, I proceed to unfold the idea of velocity, which is a particular fpecies of extenfion, and fufceptible of increafe and of diminution. When any fubftance is tranfported, that is, when it pafles from one place to another, we afcribe to it a velocity. Let two perfons, the one on horfeback, the other on foot, proceed from Berlin to Magdeburg, we have, in both cafes, the idea of a certain velocity; but it will be immediately affirmed, that the velocity of the former exceeds that of the latter. The queftion then is, Wherein confifts the (which are with great propriety omitted by the philofophic French editor of the work, twenty-feven years afterwards) and who is now crowiing with Jucccfi the arms in which aw are Jo deeply intercjlcd. This is, no doubt, a dreadful "falling off" from the majetty of the fubjecl. Who cares now about the fucceis of the Pruffian arms in 1760? But philofophers, as well as other men, are under the dominion of local and temporary circumftances. Frederick II. was then in the zenith of his glory; Euler was living at Berlin, and giving leflbns in philofophy to the niece of that illullrious prince. Is it to be wondered, then, that he fhould fink tor a moment into the courtier, and offer a drachm of incenfe to a great lady; or, that a foul fo uniformly devout, fhould acknowledge the providence of the Almighty in a particular inftance? B 3 difference difference which we obfervc between thefe feveral degrees of velocity? The road is the fame to him who rides and to him who walks: but the difference evidently lies in the time which each employs in performin...
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