. Chemical development Section [and] Mechanical Research and Development Section; summary of achievements, 1917-1918. rtHITTLESJSY MASKOne piece masii, seam undsr DIPPED MASKOne piece seamless mask, stockinette covered. this seetian soad -thoroiaghiy tested. It was foxrnd that whileextremely light and comfortable., they developed a tendencyto collaj)se around the ;nase., thns in1>erfexing with respira-tion. This difficulty was remedied to some extent by in-sertion of stiff reinforcing strips at the cheeks^ but themask was never put into The Dipped Mask>, A method for
. Chemical development Section [and] Mechanical Research and Development Section; summary of achievements, 1917-1918. rtHITTLESJSY MASKOne piece masii, seam undsr DIPPED MASKOne piece seamless mask, stockinette covered. this seetian soad -thoroiaghiy tested. It was foxrnd that whileextremely light and comfortable., they developed a tendencyto collaj)se around the ;nase., thns in1>erfexing with respira-tion. This difficulty was remedied to some extent by in-sertion of stiff reinforcing strips at the cheeks^ but themask was never put into The Dipped Mask>, A method for manufacturing the Tissat typemask by dipping the forms in-to a solution of rubber, wasdeveloped by the Ravenna iiufeber Go. in conjunction with theMechanical Section, The facepi-ece of this mask was formed by dipping analuminum form into a solution of a suitable rubber compoundin naphtha. VVhen a sufficiently thick layer of rubber hadbeen formed by successive dips, the rubber was covered withstockinette, a reinforcing strip placed around the edge, andthe mask cured in dry steam. This process gave a well-finished process without seams. The method was turned overto
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherwashington, bookyea
