lled to balance the When the cover is closed, the flanges rest in the weight of the extra keel, and the boatis moved to the grooves, and the hooks of springlatches, E (the section- place where it is desired to sink it. “Water is then ad- al view shows the construction and position of the mitted to… … the wide end of the frog are formed track flanges hav- binds the nut upon the bolt, ing rabbets at their inner ends; to the opposite endis and locks it when the lock pivoted one end of a tongue of such length that it ex- nut is screwed down. Between the nut and nut lock is longitudinal slot), rest…
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