Aviation and Aeronautical Engineering Volume 4

Aviation and Aeronautical Engineering Volume 4

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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. 1918 edition. Excerpt: ...to dry 72 hr. The panel shall then be Inclined at an angle of about 45 deg., and a gentle stream of cold tap water allowed to flow down the middle of the panel for IS hr. After wiping off any deposits due to the tap water with a chamois skin, the varnish shall show no whitening, dulling, or other defects. A small stream of boiling distilled water shall then be allowed to flow down another portion of the panel for 20 min. The water shall be siphoned through a small glass tube, directly from a container in which it is boiling, onto the surface of the panel, in such a manner that there will be no appreciable lowering of the temperature of the water before it touches the varnish film. The siphon delivery tube shall be in a plane nearly parallel to the plane of the panel, so that the impact of the water will not tend to break the film. The varnish shall show no appreciable whitening and no more than a very slight dulling or other indications of marked deterioration, either when observed immediately after removing from the water or after drying for 2 hr. note.--In general, results comparable to those given by the above method may be obtained by flowing one coat of varnish on duplicate panels of bright tin, thoroughly cleaned with benzol, allowing to dry 4S hours, and then Immersing one of the panels in distilled water at room temperature for 18 hours and the other panel In boiling distilled water for IS minutes. But the test on wood should be made in all cases when there is any doubt regarding the resistance of the varnish to water.) (/) The varnish shall be applied in three coats to two unfilled panels of maple wood not less than 14 by 45 by 2 centimeters (5% by 18 by % in.), allowing 3 days for the drying of each coat. The first coat, after drying...
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Product details

  • Paperback | 192 pages
  • 189 x 246 x 10mm | 354g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236550463
  • 9781236550460