Nitrocellulose Industry; A Compendium of the History, Chemistry, Manufacture, Commercial Application and Analysis of Nitrates, Acetates and Xanthates of Cellulose as Applied to the Peaceful Arts, with a Chapter on Gun Cotton, Volume N'. 2
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. 1911 edition. Excerpt: ...of the pyroxylin. In the author's experience this is not so. the film and liquid, arranged in such a manner as to require no pressure to actuate it, and serving only to keep the liquid from coming in contact with the film. By this method the liquid--which is the rupturing force--must conform perfectly to any irregularity in the film surface, or by reason of its being improperly clamped, and therefore the pressure will be uniformly exerted over the entire surface of the exposed film. By turning a hand wheel at the other end of the cylinder, pressure is brought to bear on the gauge and film simultaneously, and through the same medium--the liquid.1 When the film ruptures, the gauge hand rmains stationary until next reset by a special attachment similar to that of a stopwatch, registering the number of pounds per square inch required to break the film. Elongation and Recoil, often called the "stretch " and erroneously the "elasticity," is useful in determining the suitability of pyroxylin solutions as applications to skins and hides in the preparation of patent and enamel leather, where in forming the vamp of the shoe the leather is subjected to considerable stretching. There is a wide variation in extensibility, i.e., the ability of certain cellulose nitrates to stretch to maximum without breaking, and then return partially to original length. A film is cut to a strip 1 in. wide and 12 in. long, and fastened on a graduated board. A weight is attached to the end of the strip, 1 lb. for each thousandth in. in thickness having been found convenient. The weight is suspended by the film strip, and the elongation in five and ten hours noted. A 12X1 in. film, 0.005 in. in thickness, when thus suspended with a 5 av. lb. weight, ...
- 189 x 246 x 18mm | 612g
- 13 Sep 2013
- Illustrations, black and white