Identifier: architectenginee1030sanf (find matches)
Title: Architect and engineer
Year: 1905 (1900s)
Authors:
Subjects: Architecture Architecture Architecture Building
Publisher: San Francisco : Architect and Engineer, Inc
Contributing Library: San Francisco Public Library
Digitizing Sponsor: San Francisco Public Library

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sorption havebeen determined for most materials of con-struction. These coefficients are expressedin terms of the amount of absorption thematerials possess per sq. ft. compared to 1sq. ft. of open window which is acceptedas the unit and is said to be lOO/- absorp-tive and thus have a coefficient of one. Thesound absorption coefficients for commonmaterials are given in Table I. Table ICOEFFICIENTS OF ABSORPTIONThe following coefficients are taken from the pub-lished works and test data of the late Professor Wal-lace C. Sabine, of Harvard University, Professor F.R. Watson and Bureau of Standards. They are forthe standard pitch of 512 vibrations per second. Units per sq. ft. Open Window 1.00 Plaster, Hardwall or Stucco .. .025 to .034 Concrete .. .015 Brick set in Portland Cement 025 Marble 01 Glass, single thickness 027 Wood Sheathing 061 Wood, varnished 03 Cork Tile 03 Linoleum 03 Carpets, overpadding 15 to .29 Cretonne Cloth 15 Curtains in heavy folds, lined 50 to 1.00 Hairfelt 1/2 31
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