Transactions Volume 60

Transactions Volume 60

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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. 1919 edition. Excerpt: ...ft. per min. is maintained. If a cover of fine wire gauze protects the back of the glass window through which the operative watches his work, the glass will not become clouded by the abrasive action of the sand. Working gauntlets should be provided and all parts of the cabinet kept in repair to guard against leaks. On larger work and that which requires cleaning, the commercial types of mechanically exhausted sand-blast barrels and rotary tables are both sanitary and satisfactory. When the character of work handled is of too great a size to permit the employment of the rotary table, only the most approved make of air-tight and mechanically exhausted sand-blast room should be installed. It is essential that in addition to the overhead fresh-air supply, the floor be provided with a grating and be exhausted by means of a powerful down pull and that the operative be provided with special clothing and a helmet. In an efficient equipment the air of the room is completely changed every 6 sec. Babbitt And Lead Alloys As the lead content of white-metal bearing alloys may run as high as 90 per cent., the control of the health hazards involved in their production is needed. Scientifically speaking, there is no hazard from lead fume, as the temperature of the kettles is never allowed to run high enough to cause actual volatilization of the lead. The danger of lead poisoning is from the oxides that form on the surface of the molten metal, and are scattered as impalpable dust by every draft, or by the operation of charging and skimming. When pig lead is habitually used, the health of the worker may be protected by means of a mechanically exhausted crescent-shaped hood installed at the back of-the kettle. This open-shield hood covers from 33 per more

Product details

  • Paperback | 292 pages
  • 189 x 246 x 15mm | 526g
  • United States
  • English
  • black & white illustrations
  • 123687496X
  • 9781236874962