The Library of Factory Management Volume 3

The Library of Factory Management Volume 3

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1915 edition. Excerpt: ...ill successive pits, the chemist reproduced the process as it takes place in the pits with the raw bark. Dyeing the hides presented still another problem. Dyes which gave good results with hides tanned with oak bark were uncertain or worse when used in conjunction with the tan liquor. The trouble must therefore lie in the reaction among the chemicals in the dye and those in the tannic acid solution. It developed that a reagent in the liquor and one in the dye were neutralizing each other and thus preventing the action of the dye on the leather. The chemist sought for a solution which would carry the dye and not have an affinity for the tanning liquor. After a little experimenting he found such a solution and ascertained as well, that another make of dyes already on the market showed the same analysis as the solution he had developed. Being thus assured a supply of a standard tanning agent and of dyes that were chemically harmonious with it, the tanner, who was an expert in the handling of leather, had no difficulty in turning out as good leather as with the raw oak bark and his home-made dyes. HOW MIXING METALS BY RULE OF THUMB HANDICAPPED A FOUNDRY E1ALLING in with the present tendency toward standardized, cooperative effort rather than individual expertness, a foundryman sought out a commercial laboratory not long ago. For twenty-five years the metals going into his brass castings had been proportioned by an old melter who had grown gray in his service, and it had never occurred to the foundryman that the younger generation was not receiving such training as would fit one of them to take the old man's place. To his great surprise, after the melter's sudden death, he had found it impossible to replace him with anyone who had adequate experience...show more

Product details

  • Paperback | 62 pages
  • 189 x 246 x 3mm | 127g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236652320
  • 9781236652324