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Knight's Mechanical Encyclopedia (ed. Knight) 6 4 Browse Search
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Knight's Mechanical Encyclopedia (ed. Knight), E. (search)
He cut them from the sheet with the aid of metallic formers, and folded and gummed them by hand with the brush, in the manner generally practiced until a comparatively recent period. An envelope-machine was invented as far back as 1840, but De la Rue's, 1845, appears to have been the first which achieved any notoriety. Envelope-machines, so called, generally comprise only provisions for folding and gumming the envelope after it has been cut to the proper form. The English envelope-machine, invented by Hill and De la Rue, operates upon diamond-shaped pieces of paper, which are successively placed on the platform. A plunger descends and forces the central part of the paper into an oblong quadrangular cavity; the four corners stand erect and are successively flattened by four fingers. When the folding is completed, two india-rubber fingers lightly touch the envelope and draw it aside to make room for another. These fingers are small metallic cylinders with tips of india-r
Knight's Mechanical Encyclopedia (ed. Knight), P. (search)
.Traphis, e, XVIII. 4. Rosaceae, a.Tulip leaves, d. Rose mallow (Hibiscus), a.Turf, a; d; e, IV. 671, VI. 210, 249, XI. 147, XXII. 171; g, II. 150. Rubiaceae, a Rue, c, XIII. 117 Rushes, a : e, XIII. 117, XIV. 17, XVII. 171 : f, XV. 289.Turnips, a. Twitch grass, a. Rutaceae, a.Typha, d; e, XVII. 170. Rye grass, a.Typha lutee moon, in 1850, with the Cambridge refractor of fifteen inches aperture. Many others followed. Mr. Rutherford's photographs of the moon are most excellent. Mr. De la Rue, in England, must also be mentioned. Mr. Rutherford of New York City has been, for some time, photographing groups of stars, by which their positions are exssing through is enlarged to four inches. The instrument is mounted on an equatorial stand and actuated by suitable clock-work. A similar instrument was used by De la Rue at Kew. Photo-hy-al′o-type. See Hyalotype. Pho′to-in-tagl′io En-graving. A process in which, by photographic means, lines are etched in a plate to b<