American Builder Volume 20

American Builder 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. 1915 edition. Excerpt: ...run of the common rafter for one foot; and these lengths when transferred to the upper square are shown to be 13 and 17 respectively. (Neither of these are absolutely correct but near enough for practical purposes.) That is the reason these figures are used for the seat cut for any pitch the building may have. In this, we have taken the % pitch for illustration purposes and the lines from 12-13 an.c' l7 on the tongue to 6 on the blade represent the length of the rafters for a one foot run of the building. Now coming to the fractional part of a foot run, suppose it to be 8 inches; then a plumb line from eight cutting the runs as shown, and their lengths transferred to the tongue of the upper square will be found to be 8 8/12 and 11 4/12 respectively and continuing on up, cutting the pitch lines and all above these points will represent the corresponding lengths for an 8-inch run. Now, for an example, say, the run of the building is 9 feet 8 inches. We place the square 10 times at the figures mentioned for one foot run and at the last placing, lay off the seat cut line, then slide the square back along this line till 8 rests at the point where 12 was before, paying no attention to the figures on the table, and the latter will rest at the proper place for the plumb cut. Proceed in like manner for the hips, using the figures that give the respective seat and plumb cuts, then slide the square back to 88/12 and 11 4/12 for the respective hips, and the lengths of the rafters will be properly cared for..Something about Pitches Now, we are going to branch off and show some things not generally known about pitches. In Fig. 2 are shown the Fig. 2. Fig: -2. Some Cots for One-fourth and Whole Pitch, Except Reversed on Square. pitches for the common and...show more

Product details

  • Paperback
  • 189 x 246 x 26mm | 889g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236959787
  • 9781236959782