Siebe Gorman & Co 8 Bolt Diving Helmet
RH Davis Original Patent
This helmet is fitted with eight bolts not the more common 12 bolts or 6 bolts . There are 4 brailles with a raised ridge adding strength to the brass. The pattern ensures a thoroughly watertight joint between the helmet and suit. The front window could be fitted with metal crossbars if required. The catalog code for this helmet was EIGHT.
Side view of the 8 bolt helmet . The outlet valve can be regulated by
pressing the head against the disc on the inside of the helmet.
Generally, unless otherwise specified this type of valve was one of the types fitted if there was no telephone fitted to the helmet.
of the 8 bolt and a later 6 bolt helmet. The bonnet size is larger on
the later helmet .