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same panel to the stern. The bars support the tower against the strain of the bucket ladder. Each side of the tower is braced by latticed channels united by horizontal and diagonal members, and converging toward the side of the boat. Two plate keelsons 36 inches deep extend from the rear of the foot of the tower to the foot of the derrick, as shown in Figs. 2 and 3. The derrick is 80 feet long, and is made up of latticed channels 12M inches, united in the same manner as the tower. Two bars 1%doi:10.1038/scientificamerican03011886-130cbuild fatcat:mjchctjlrbclrl3tobrfdbjktq