Reference Book of Eletrotyping and Stereotyping; Giving Information and Instruction Regarding Processes, Materials and Machinery (Large print, Paperback, large type edition)

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1905 edition. Excerpt: ...than in those of high gravity, and the actual gravity is found by the level at which the liquid stands on the graduated portion when the apparatus is floating freely in it. Hydrometers of this kind are sometimes graduated so that the specific gravity is read off direct from the scale, others are graduated by Baume, s method, and the reading may then be converted into the n-umber representing the true density, by reference to the above table. STATISTICS.--A London writer states that there are fourteen electrotype foundries in that city, whose total output is 80,000 (approximately $400,000) yearly. In Chicago there are twenty foundries, having an estimated output of over $500,000. Prices in the two cities do not differ materially, while the population of London is probably three times that of Chicago. On the basis of population, as compared with Chicago, London should support sixty electrotype foundries and should produce $1,500,000 worth of electrotypes annually. It is evident that English printers do not employ electrotypes as extensively as the Americans, and one reason for this may be found in the popularity of stereotyping. Nearly every large printing establishment operates a stereotyping plant, and it is, to a certain extent, independent of the electrotypers. In Chicago, very little job-printing is done from stereotypes. Few printers have facilities for doing their own stereotyping, and, when purchasing plates, most of them prefer to pay the extra cost for electrotypes. SWEATING.--Shave the top of the base and the back of the plate so as to have clean, smooth surfaces. Do not shave the bottom of the base. Brush over the shaved surface of the base with soldering fluid, made by dissolving scraps of zinc in muriatic acid to..."