. Chemical development Section [and] Mechanical Research and Development Section; summary of achievements, 1917-1918. aaflA- EABLY TYPii OP UAVY HEAD MASK WITH FELT FILTERAND WATERPHOOP A COMPLETE lUVY EMIi i^lASK^klTHOUT SmKS FIITSB. of these outlets and oondusts the inhaled air into the eye-piece wall. The exhalation tube, upon which the flutter valve isseated, is formed from rubber as part of the facepiece andextends upward between the eyepieces, a rubber dam separatesthe eyepiece chaiuber from the lower part of the mask. Moistair is prevented from getting up to the eyepieces by sma
. Chemical development Section [and] Mechanical Research and Development Section; summary of achievements, 1917-1918. aaflA- EABLY TYPii OP UAVY HEAD MASK WITH FELT FILTERAND WATERPHOOP A COMPLETE lUVY EMIi i^lASK^klTHOUT SmKS FIITSB. of these outlets and oondusts the inhaled air into the eye-piece wall. The exhalation tube, upon which the flutter valve isseated, is formed from rubber as part of the facepiece andextends upward between the eyepieces, a rubber dam separatesthe eyepiece chaiuber from the lower part of the mask. Moistair is prevented from getting up to the eyepieces by smallflutter valves seated on metal frames in the dam. The face-piece and hood are cured on a flat form cast of eyepiece forms and the rods extending upward from themto serve as cores for the inhalation tubes are part of theform. The work of this Station on this facepiece has been anattempt to increase the comfort and efficiency of the comfort of the mask has been increased by bringing theinhalation tubes in at the side of the eyepieces instead ofthe top, thus relieving the pressure on the eyebrows. The dam m. th which the mask was equipped gave a, greatdeal of pressu
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherwashington, bookyea
