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Two 1939 descriptions of a Braby pontoon in Auckland stated:

A new type of floating jetty will he used in Auckland for the berthing of the flying-boats. Mr. Turnill stated this morning that this type is known as the "Braby pontoon", and it has been used previously only at Southampton. It has been well tested there and has been found to be most satisfactory. It consists of two twin sections joined in an arc underneath the water.

Shaped like a U, the pontoon resembles a miniature floating dock, and consists of two parallel decks joined by a submerged framework. Tanks give the necessary buoyancy. When the flying-boat has landed, it is warped into position by the ground crew, and is drawn tail-first into the pontoon, coming to rest with the hull between the two sections of decking and above the submerged frame. Inflated buffers on the inner edge of the decking prevent the delicate hull from being damaged.

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