Hansen was the Danish inventor of the 2 bolt helmet. It has a metal clamping piece with a bolt on the front and on the back. After the diver has put the suit on, the clamping piece is put under the Indiana rubber collar. The corselet, which is formed integral with the helmet has a hole back and front, corresponding with the bolts on the clamping piece. It is put over these bolts and the whole is then screwed up with two nuts.

This helmet was very popular for easy short diving jobs in shallow water. The reason for this was the opening in the suit. This was so large that the diver could be dressed by just one attendant. In this way the costs could stay low: one diver and two guys on the lever pump was all that was needed ! 

Siebe Gorman was one of the companies that produced this Danish patented helmet. To see more of these beautiful hats, visit the Danish section of the virtual helmet collection.

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