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Knight's Mechanical Encyclopedia (ed. Knight) 4 0 Browse Search
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Browsing named entities in Knight's Mechanical Encyclopedia (ed. Knight). You can also browse the collection for M. Collas or search for M. Collas in all documents.

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Knight's Mechanical Encyclopedia (ed. Knight), E. (search)
. Eccentric-engraving, for a certain class of patterns in calico-printing, is performed by a diamond etching-point on the varnished roller. The points are moved by elaborate machinery, and the effect is analogous to that of the eccentric and rose-engine lathes. 2. An apparatus on the principle of the pantograph, but provided with a cutting device and machinery for causing pressure upon the surface to be engraved, so as to produce lines similar to those made by hand with the graver. Collas (English patent) engraving-machine, 1830. Electro-magnetic engraving-machine used in Germany, 1854; in America, 1858. Guerrant and Field's engraving-machine was patented in 1867, and was in operation in New York City during the year 1868. To engrave by means of this machine the operator sits with a copy of the drawing, photograph, or whatever design is to be engraved, directly in front of him. A small pointer rests upon the drawing, and the whole operation consists in moving the pointer
Knight's Mechanical Encyclopedia (ed. Knight), M. (search)
o a perpendicular line, the pattern being worked in the net, and the plait-thread surrounding the flowers. Me-com′e-ter. （Surgical.) A graduated instrument used at the Hospice de Maternite in Paris, to measure new-born infants. Med′al. An ancient or a memorial coin. Me-dal′lic En-grav′ing. In this beautiful art the direction and distance of the lines are so modified as to give the appearance of a figure or object in relief. It is executed by machinery. The machines of M. Collas and Mr. Bate, as well as those of Asa Spencer, Mr. Froude, and Mr. Saxon, are all improvements upon an apparatus described in a French work, the Manuel de Tourneur, about 1814. This machine will give a good general idea of the construction of these machines, and its operation is as follows: — The medal and the copper on which the medal is to be engraved are fixed on two sliding plates at right angles to each other, and so connected that when the plate on which the metal is fixed