. The Encyclopaedia Britannica; ... A dictionary of arts, sciences and general literature . gauges to insure its accuracy. When finished itis held over a light, the flame of which blackens the letter, andthus enables an imjjression, called a smoke proof, to be stamjiedon paper. When the letter is perfect, it is driven into a piece ofpolished copper, called the drive or strike (fi^. 3). This passesto tho justifier, who makes the width and depth of the facesuniform throughout the fount. They mnst then be made to lineexactly with each other. When completed, the strike becomes thematrix (fig. 4),
. The Encyclopaedia Britannica; ... A dictionary of arts, sciences and general literature . gauges to insure its accuracy. When finished itis held over a light, the flame of which blackens the letter, andthus enables an imjjression, called a smoke proof, to be stamjiedon paper. When the letter is perfect, it is driven into a piece ofpolished copper, called the drive or strike (fi^. 3). This passesto tho justifier, who makes the width and depth of the facesuniform throughout the fount. They mnst then be made to lineexactly with each other. When completed, the strike becomes thematrix (fig. 4), wherein the face of the tjpe is made. This methodof making a matrix has until now been in almost universal use inGreat Britain. It is, however, a very slow and costly America the great majority of matrices are made the design of the fount to be produced is original, it is oftencut by hand or by an engraving-machine on the piece of metalwhich is to form the matrix. If, on the other hand, an existingfount has to be copied, the matrix is made by Fio. 6 Mould. A perfectly good tj-pe is selected, and inserted In a mould speciallymade, called a. fusible mould (fig. 5). Sufficient metal of a morefusible natura than thetype is cast round it, andforms a shajie similar tothat of the ordinary mat-rix. This fusible cast isthen placed iu a box pro-tected by glass and gutta-percha, in order that thecopper deposit may bekept square and to theproper oimensions. Thisarrangement also limitsthe deposition to the box is Immersed inthe copper electrotypingsolution, in which it maybe left until the depositof metal has increased toa thickness at which itmay be backed up with copper, or it is left until it reaches thefull thickness, which is about ^ of an inch. It is then fittedin line, set, position, and height. The minutest imperfection orblemish is reproduced by the deposition, and the type cast fromsuch a matrix is a perfect counterpart of the
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Keywords: ., bookcentury1900, bookdecade1900, bookidencyclopaedi, bookyear1902
