. The railroad and engineering journal . S. N. Knight and J. P. Lambing, of California,and made by Knight & Company, engineers and millwrights atSutter Creek, Amador County, Cal. The grab, as it may be called, is shown empty and ex-panded in fig. I. In fig. 2, it is shown closed buried in theearth, and filled ready for hoisting. The apparatus consists or more strong hinged leaves or shovels linked to the crosshead of a powerful steam piston seen on top, so the leaves areforced into material that could not be worked with the commonclam-shell dredge buckets. The engraving is taken from th
. The railroad and engineering journal . S. N. Knight and J. P. Lambing, of California,and made by Knight & Company, engineers and millwrights atSutter Creek, Amador County, Cal. The grab, as it may be called, is shown empty and ex-panded in fig. I. In fig. 2, it is shown closed buried in theearth, and filled ready for hoisting. The apparatus consists or more strong hinged leaves or shovels linked to the crosshead of a powerful steam piston seen on top, so the leaves areforced into material that could not be worked with the commonclam-shell dredge buckets. The engraving is taken from thegrabs forming a part of the plant at the .Arroyo Seco Mine nearlone, in Amador County, where the workings are as peculiaras they are extensive. They consist of deep open cutting inthe bed of a stream, and the operations ate not different fromdeep cuts made for railways or other work. The grab is 6 diameter and it ft. high over all, and although made ofwrought iron and steel throughout, weighs 3 700 lbs. when ar-Ktn 1 Vn: ^^s^-1?,^** ranged for gravel and hard working, and lifts 2j tons at a steam cylinder is of wrought iron 22 in. in diameter,with a stroke of 30 in., and will a pull of more than 30,000lbs., which, with the gravity of the machine, gives a penetraling force of more than 16 tons, enough to penetrate material ofalmost any kind except solid rock. The boom on which the grab is swung is no ft. long, swingsthrough iSo°, and delivers a load in l^ to 2 minutes time, from20 to 30 ft. high. In one modification proposed by Knight &Company, the boom swings through a complete circle, and con-sequently can load cars behind, when making a cut. In work-ing under water the grab cylinders can be operated by air in-stead of steam.—/iii/tis/rr, Snii Francisco. Vol. LXIV, No. 8.] ENGINEERING JOURNAL. 337 THE RAILROAD^ND Engineering JOURNAL. (established in 1832.) the oldest railroad paper in the world. Published Monthly at No. 145 Broadway, New York. M.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectrailroa, bookyear1887
