The Brickbuilder Volume 19

The Brickbuilder Volume 19

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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. 1910 edition. Excerpt: ...157 fractional part of each sound' absorbed in each deflection sounds will be laud enoug/z. If the total is less than I the by reference to the following table of approximate combined effect will not be loud enoug/1. This procedure absorbing C3.p3.C1l;lS, which, for convenience, is repro-will be best understood from the following illustrative duced here from free from the wall absorb three-quarters of the sound. to the bearer we have The audience and very heavily upholstered furniture d ___ d + 45 = 74 2 1 absorb all the sound. The four factors of the initial intensity having been UPI1 Teaching the bearer the intensitl' f the deflected determined by the means above indicated, their com-Sound 15 ' bined effect can be computed by the following method: --: 1 '7-l 1 I is the minimum efficient intensity and corresponds t the intensity f 3' direct 5"nd at 50 feet from the The total intensity of the direct and deflected sounds speaker. As the intensity of sound varies inversely as upon reaching the hearel. is the square of the distance from its source, the intensity iof any single sound which has traveled a distance d caused this total reduction must then be calculated and added to the distance between the first and second points of deflection. The intensity at the second point of deflection may then be calculated, further reduction made for the loss due to the second impact, and so on until the sound reaches the bearer. In this way the final intensity of each sound reaching the hearer within the first fifteenth of a second may be determined. These intensities may then be added together. If the total is as great as I, then the combined efiect of the component one deflection by the paths SBA, SCA, SDA and SEA, and two more more

Product details

  • Paperback | 124 pages
  • 189 x 246 x 7mm | 236g
  • United States
  • English
  • black & white illustrations
  • 1236737741
  • 9781236737748