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"SftF ID ftmf X Office of The Quartermaster General Military Planning Division Research and Development Branch -- ^ m ^05^ DTIC CELECTE M OCT 1819891 I D0 Lli TEXTILE SERIE5 - REPORT NO. 35 in CM rs in in 0) < i Q < Mi 8 i ilSLATIOM HIP BETIVEEK MEASUREMDtJT OF AIR FEf?ia:ABILITY BY TITO MACHINES M, 1. Landsberg and Gerald Winston DISTP-ISUTION STATiM NT A | Appr~v d ioi public release \ Released for public ii oraoti i by The Office of the Publication rbard U, o. JepartnBnt of ofrimerce 89 10 17 082 THIS DOCUMENT IS BEST QUALITY AVAILABLE. THE COPY FURNISHED TO DTIC CONTAINED A SIGNIFICANT NUMBER OF PAGES WHICH DO NOT REPRODUCE LEGIBLYo ,, FOREWORD The concept of wind-resistant textiles was introduced to the armed forces with the procurement of a lightweight cotton fabric such as that worn by members of Admiral Byrd's polar expeditions. When specifications for this material were first prepared there were relatively few instrume 'ts in the textile industry for evaluating air permeability, , wind resistance The Gurley Densometer described in this report was originally developed for the testing of paper and was later adapted as an instrument to determine fabric porosity, during the latter years of the war the Crazier Air Perraea- meter, a machine designed by Uy, Herbert Schiefer of the National Bureau of Standards, was introduced as another method for determining this property.

FOREWORD The concept of wind-resistant textiles was introduced to the armed forces with the procurement of a lightweight cotton fabric such as that worn …

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