Enciclopedia Britannica; un dizionario delle arti, scienze e literatureWith generale mappe nuove e originali articoli americani da eminenti writersWith American le revisioni e aggiunte, portando ciascun volume fino a data . ers esso easyto girare una superficie cilindrica vero da estremità a estremità, un taskT.hich prima della sua introduzione era stato uno dei extremedifficulty, anche per il più altamente skiUed workman, sothe macchina levigatrice sostituisce, mediante un metodo che dia vastlysuperior residts, il difficile e costoso processo di handchipping e archiviazione, mediante il quale le superfici piane di metallo wereformerly prodotta. Sebbene

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• ID dell’immagine: 2ANDYBA
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• Dimensioni: 1864 x 1341 px | 31,6 x 22,7 cm | 12,4 x 8,9 inches | 150dpi

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The Encyclopedia britannica; a dictionary of arts, sciences, and general literatureWith new maps, and original American articles by eminent writersWith American revisions and additions, bringing each volume up to date . ers it easyto turn a cylindrical surface true from end to end, a taskT.hich before its introduction had been one of extremedifficulty, even for the most highly skiUed workman, sothe planing machine supersedes, by a method giving vastlysuperior residts, the difficult and costly process of handchipping and filing, by which flat surfaces of metal wereformerly produced. Although it is a comparatively moderninvention, its real origin is obscure. No drawings ordescription of any planing machine at all resembling thosenow in use were published in England previously to thoseof one made by Clement in 1825, which appeared inthe Trannadions of the Society of Arts. With this beauti-ful machine, which was of considerable size, being capableof admitting articles measuring as much as 6 feet in heightor width, he obtained results which would satisfy -allordinary requirements at the present day. The ordinary self-acting planing machine is shown infig. 7. Its action bears no resemblance to the familiar. Fio. 7. —Planing Machine.process ot wood planing, but is analogous to that by whichthe successive cuts of a narrow tool produce a cylindricalsurface in a .slide lathe. A traversing table carries the work and forces it against the tool, which is stationarywhile making its cut, but between the cuts has a slight feed motion along its horizontal slide. Perfectlyparallel cuts are thus taken from every portion of the workin succession, the result being a .surface, not indeed per-fectly smooth and free from scores, but (what is generallyfar more important) possessing a general flatness and free-dom from twist which can be obtained only with a greatexpenditure of time and trouble by hand labour. Theextent to which machinery has cheapened work of thiskind will be appreciated

Parole chiave associate all'immagine

• bookauthorbaynesth
• bookcentury1800
• bookdecade1890
• bookyear1892