. Chemical development Section [and] Mechanical Research and Development Section; summary of achievements, 1917-1918. y The clarifying tubes and chin rest are of molded rub-ber and assembled at the same time as the die casting and eye-piece frames. The clarifying tubes are the same design usedat present, -and deliver the incoming air directly againstthe eyepiece lenses* The chin rest is made with rather longhorns so as to hold the mask firmly in place. The present Akron Tissot is a further development ofthe ,. mask* The piincipal alterations are the stockinettecovering foi* the face
. Chemical development Section [and] Mechanical Research and Development Section; summary of achievements, 1917-1918. y The clarifying tubes and chin rest are of molded rub-ber and assembled at the same time as the die casting and eye-piece frames. The clarifying tubes are the same design usedat present, -and deliver the incoming air directly againstthe eyepiece lenses* The chin rest is made with rather longhorns so as to hold the mask firmly in place. The present Akron Tissot is a further development ofthe ,. mask* The piincipal alterations are the stockinettecovering foi* the facepiece which replaces the black protec-tive rubber, alterations in the aluminum form to give greaterspace between the mask and face* stiffening of the facepiece,and a head-harness of elastic webbing* Whittles&y Mask. In April.,. 1918,. Dr. Whittlesey of the Company developed the idea of applying a rubber coatingto stockinette on a calender,-cutting oiit the facepiece, ce-menting the seam omder the chin,-and curing the ma^ik on a flatform of wood or metal* A nmiiber of these masks were made for -67-. rtHITTLESJSY MASKOne piece masii, seam undsr chin.
Size: 1337px × 1868px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublisherwashington, bookyea
