Bulletin Volume 44-54

Bulletin Volume 44-54

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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. 1914 edition. Excerpt: ...is formed. Sanding of this surface will show the rust permeated deeply through the film toward the wood. A paint made of zinc, on account of its hard and impervious surface, will not absorb the iron rust, which will run from the nail head as a light colored streak easily removed by light sanding. This same condition of film may also be shown by drawing a line upon the weathered paint surface with a fountain pen. A lead film will act like a piece of soft absorptive blotting paper, and the ink will spread out to a wide mark. A zinc film will act like a piece of highly coated glazed paper, and the line will not spread. These tests and others are often used by the writer when examining an old painted surface. While of some minor use for that purpose, their chief virtue must be recognized in the lesson which they teach; namely, that a paint made wholly of lead is soft and porous, while one made wholly of zinc is hard and apt to be brittle. These defects are not shown by paints made of a mixture of the lead and zinc pigments, with or without a moderate percentage of the inert pigments. Ubserwatiorzs on Painted Surfaces Exposed to the Essect of Gases EfuoI"ced by Polluted Rivers.' During the latter part of November the writer was invited by a friend to spend a day at Passaic, N.., a town noted for its silkdyeing and fabricfinishing industries, with the object of studying the wearing of paint in that community. Coming into the town, the train passed over a black-colored stream, the Passaic River, which gave forth a very unpleasant odor. I was informed that during the summer months the river pollution was greatest and at such times large quantities of hydrogen sulphide gas were evolved. During an automobile trip along the..
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Product details

  • Paperback | 120 pages
  • 189 x 246 x 6mm | 227g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236977130
  • 9781236977137