Compressed air . The combination with a rock-drill cylindeihaving a rear extension, of a piston having ahollow tail-rod extended into and entirely in-closed by said rear extension, a sleeve surround- COMPRESSED AIR. 3974 ing the tail-rod forming an annular chamberwithin the rear extension, a rifle-bar telescopingwithin the tail-rod and a port leading from theannular chamber to the air-space within thesleeve and tail-rod. 810,672. DISCHARGE-VALVE EOR FLUID-COMPRESSORS. William Prellwitz, Easton,Pa., assignor to The Ingersoll-Sergeant DrillCompany, New York, N. Y., a Corporation ofWest Virginia.

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Compressed air . The combination with a rock-drill cylindeihaving a rear extension, of a piston having ahollow tail-rod extended into and entirely in-closed by said rear extension, a sleeve surround- COMPRESSED AIR. 3974 ing the tail-rod forming an annular chamberwithin the rear extension, a rifle-bar telescopingwithin the tail-rod and a port leading from theannular chamber to the air-space within thesleeve and tail-rod. 810,672. DISCHARGE-VALVE EOR FLUID-COMPRESSORS. William Prellwitz, Easton,Pa., assignor to The Ingersoll-Sergeant DrillCompany, New York, N. Y., a Corporation ofWest Virginia. Filed Apr. 1, 1905. Serial , A valve-seat, a valve, its spring for yieldinglyholding the valve closed, a removable valve-guide engaged with the seat and means foryieldingly holding the valve guide and seat inposition. 810,671. SEPARABLE Prellwitz, Easton, Pa., assignor toThe Ingersoll-Sergeant Drill Company, NewYork, N. Y., a Corporation of West Mar. 8, 1905. Serial No. 249,135.

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Keywords: ., bookcentury1800, bookdecade1890, booksubjectcompres, bookyear1896