Mathematical Elements of Natural Philosophy (9781236201522)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1747 Excerpt: ...in the faid Line, let Gunpowder be placed in the Focus of the other Mirror in the fame Line; if you make the Coal burn fiercer with a Pair of Bellows, the Gunpowder will be fet on Fire; for by the fecond Reflexion the Rays are collected, which after the firft are parallel. For when 3306. the Focus, in "which the parallel Rays are collected by the concave Speculum, becomes the radiant Point, the Rays being a little difperfed, are reflected parallel to one another. 3296-3244 What has been faid-j-concerning parallel Rays a little difpcrfed 337and direttt may alfo be applfd to oblique Rays. For if there be fuch Plate 105. Rays DA, da, thefe being reflected mutually, interfecl: one another Fig. 6. atF in fuch manner, that AF may be equal to a Quarter of the-f-3296. Cord A B j which follows from the Propofition which will be prefently deliver'd, and demonftrated in the following Scholium. 3315 Hence we deduce a Method of reprefenting Objeds in a dark 3308. Pkce, like that mention'd before, by making ufe of a convex Lenfe. 3058. E e 2 Let Plate 106. Let there be a Hole F in a Wall; let ab be a concave SpecuFig. i. lum, fo plac'd, that the Rays pafling through F, and which are perpendicular to the Wall, may be direct, and if they are parallel, they may after Reflexion be collected in the Center of the Hole: The Rays which being' reflected from Objects mutually interfedt one another in this Center, are reflected perpendicular to the 3306. Wall. Let A F be Rays proceeding from a Point of a diftant Object, which we look upon as parallel by reafon of the Diftance of the Point; among thefe, that which pafies through the Center of the 3306. Hole is reflected from the Mirror perpendicular to the Wall, and together with this the reft of the Rays proceeding from the fa...

Product details

• Format Paperback | 166 pages
• Dimensions 189 x 246 x 9mm | 308g
• Publication date 01 May 2012
• Publisher Rarebooksclub.com
• Publication City/Country Miami Fl, United States
• Language English
• Illustrations note black & white illustrations
• ISBN10 1236201523
• ISBN13 9781236201522

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