art, of No. 4628 Ridge Avenue, inch: The air is taken in at the top of the piston, and a train, is shown herewith, and has been patented by Roxborough, Philadelphia, Pa. Two circular plates compressed through a water chamber into an annular Messrs. David Vinton, Jr., and F. H. Vinton, of space on… … cent of the total power available on the rope alone, and in coal mines, where fuel is cheap, the question of effi- VINTONS’ RAILROAD SIGNAL, ed'to revolve upon the lowerone, and both plates being ciency is not of great importance. On theother hand, held incontact. The lower plate has a rear…
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