National Geographic : 1907 Oct
Photos by Gilbert H. Grosvenor Pictures of the "B B" An experimental boat of Dr Alexander Graham Bell, driven by aerial propellers. The boat carries a 20-horse-power motor, weighing about 115 pounds. The motor was built by G. H. Curtiss, of Hammondsport, N. Y . The boat, which has attained a speed of nearly Io miles an hour in smooth water, is used by Dr Bell to test the efficiency of aerial propellers of different designs. In the pictures it is being guided by Mr Curtiss.