These signal lights are intended for use on vessels propelled by steam, and those exclusively. The glasses in the lamps could be colored variously, and by alternately revolving them and checking their motion, a code of signals could be arranged; besides they will specially indicate the presence of a steamer, and there will be less likelihood of mistakes and consequent collisions than at present. They are the invention' of Albert Potts, northeast corner of Third and Willow streets, Philadelphia, from whom further information can be obtained, and who patented them Sept. 8, 1857.