Light - Mark V Top Window

Product Features

The term "light" is historically accurate when referring to the window glass in a diving helmet. In nautical terms a fixed window on a ship could be referred to as a light, as in skylight or deadlight.

All A J Morse & Son Diving Helmets made by DESCO use Borosilicate Glass (Pyrex) lights. Borosilicate Glass has much better temperature stability than normal glass. The Mark V helmets used lights with bevelled edges which conform to the frame.