Diving Mask, Full Face 08
Diving Mask, Full Face 08 : Features: (3) Full Face Mask Configurations: (3. 5) Shape of Mask Window: The fulllface mask's window can be various shapes: - Circular, as in wartime Italian frogman's rebreathers and in some early British frogman's rebreathers. Oval like a sport eyes-and-nose mask, in some early British frogman's rebreathers. Triangular with rounded corners, in some Siebe Gorman fullface masks intended for use with an aqualung. Triangular, with sharper corners, in rebreather masks made by DESCO, See: http: //www. therebreathersite. nl/03_Historical/Desco_B_Lung. htm. Some of DESCO's fullface mask windows were egg-shaped (wider above). In both these types of DESCO mask the window was very near the face for better sideways and up and down visibility and less deadspace, with a triangular bump-out for the diver's nose. Rectangular with the ends of the sides bent back for better sideways visibility, as in many fullface masks made by Siebe Gorman: See: Siebe Gorman CDBA. Rectangular, continuously curved, for industrial breathing sets for use out of water. In some old masks, largely for industrial use out of water, small eye-windows above a rounded opaque nose-and-mouth mask like some gasmasks. The shape and maximum size of mask and helmet windows changed with availability of transparent materials less brittle and more easily moulded than glass to make them out of: perspex came on the market in 1933 and polycarbonate in 1958. Hardhat diving helmet windows had been of glass for a long time, but a hard helmet screwed to the corselet can carry glass much thicker and stronger and heavier than a mask strapped over the face can
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