The American Blacksmith; A Practical Journal of Blacksmithing and Wagonmaking Volume 20

The American Blacksmith; A Practical Journal of Blacksmithing and Wagonmaking Volume 20

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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. 1920 edition. Excerpt: ...multiplying, subtracting, and then wondering if your figures are correct, but this way is "positive." There 's no guess work about it. For example, What is the area of a ring whose distance D (sec sketch) is 10 inches and whose width "w" is one inch? Connect the 1 (column A) with the 10 (column C) and the intersection of the straight line with column B shows the area to be a trifle over 31 square inches. Isn't that simple enough'? It is a very easy matter to measuse the distance D and the width w with a rule, and the same rule can then be used as a straightedge in solving the problem on this chart. W. E. SCHAPHORST In order to obtain a firmer hold for machine screws when used in threaded holes in sheet metal, drill the hole with a. drill somewhat smaller than the tap to be used. Then use a drift of the proper diameter to enlarge the hole. On using the tap, quite a number of extra threads can be cut, on account of the drift raising a bur on the metal. THE BASEMENT FIRE HAZARD Basement fires' constitute a seri ous hazard which demands greater attention on the part of property owners. Most of them are due to waste paper, packing boxes, exeelsior and rubbish which should not be allowed to accumulate. "Out of sight is out of mind," and many business men would be astounded if they realized the dangerous conditons they are permitting to exist in the portion of their premises usually most unguarded. Fires starting in basement frequently get such a start that they are a serious menace to the lives of those on the floors above. The remedy recommended by the fire prevention experts is better housekeeping in the basements, enforced by regular and frequent inspections by the owner more

Product details

  • Paperback | 308 pages
  • 189 x 246 x 17mm | 553g
  • United States
  • English
  • black & white illustrations
  • 1236983750
  • 9781236983756