INFORMATION, ART, SCIENCE, MECHANICS, CHEMISTRY, AND MANUFACTURES. re per Annum, Vol. XXI.=-=No. 5. NEW YORK, JULY 31, 1869. {IN ADVANCE. (NEW SERIES.] Improved Machine for BPrilling Rocks. In this truck the car bolster is suspended by swinging links Improvement in Car Trucks. ance of strain and… … end a disk, on which are hung two, three, BANK’S AUTOMATIC ROCK DRILL. to six wheeled trucks, as to four-wheeled or four hammers, which in rotation strike freight-trucks. the head of the drill, and the tangs of which, when the hammer’ such devices or any combination of them the tendency to]…
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