. The Emporium of arts & sciences. ends of a tram-plate,in which H shows the flanch or upright edge, I the flatpart or sole on which the wheels of the waggons run, Done of the plugs, K the projection behind the flanch tomake the plate lie firm on the blocks. General Observations. The advantages of laying plates on the above principleare obvious; the blocks being put in their places neversink below their intended level, the act of driving eithernail or plug, (which requires a considerable degree offorce, and too frequently destroys the level of the road,)being here unnecessary. In the common mo
. The Emporium of arts & sciences. ends of a tram-plate,in which H shows the flanch or upright edge, I the flatpart or sole on which the wheels of the waggons run, Done of the plugs, K the projection behind the flanch tomake the plate lie firm on the blocks. General Observations. The advantages of laying plates on the above principleare obvious; the blocks being put in their places neversink below their intended level, the act of driving eithernail or plug, (which requires a considerable degree offorce, and too frequently destroys the level of the road,)being here unnecessary. In the common mode of mak-ing rail-roads, from the irregularity of nails, particularlyin forming their heads, few can be driven exactly evenwith the plate, and they are perpetually obstructing thepassage of the waggon; the workmen frequently not pro-portioning their holes and plugs to the hole in the blockalso occasions considerable breakage; the exertion ne-cessary to fix a rail or plate completely is great, and ifi/h >?ij _1 v >?/yp // p\. Emporium efJrts Sc Sciences— VcL 2/iLn. Tv&bo i&C Description of a Screw Press. 373 numbers of plates, particularly when the iron is short orbrittle, are broken near the mortices by missing thestroke of the hammer, which must be used with greatforce. Advantage gained in laying my Tram-Plates in Com-parison with other Modes. Nails used in a mile, 3520 of 3 in the pound, at 4d!. per lb. . 19 11 0Nails lost or defective, computed at per mile 10 0Plugs with their loss . . 6 5 0By breakage of rails, average from experience 7 10 0Lessened by labour in block laying, calcu-lated at only two pence per yard . 14 IB 4By breakage of blocks . . .10 0 £49 19 4 This calculation does not take in annual loss of nails,and breakage of blocks, which is considerable. No. 73. Description of a Screw Press with an expanding Mr, William Bowler. (With an engraving.) SIR—The screw and spring-press which I have thehonour to present to the inspection and for the ap
Size: 1231px × 2029px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, booksubjectindustrialart, booksubjecttechnology
