rt, 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 compressed through a water chamber into an annular Roxborough, Philadelphia, Pa. Two circular plates Messrs. David Vinton, Jr., and F. H. Vinton, of space on… … cent of the total power available on the rope alone, and DORWART'S PEGGING JACK. in coal mines, where fuel is cheap, the question of effi- VINTONS' RAILROAD SIGNAL. ed to retolveupon the lowerone, and both plates being ciency is not of great importance. On the other hand, held in contact. The lower…
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