. Appleton's dictionary of machines, mechanics, engine-work, and engineering. 8072. Fig. 3070, weighing 3 qrs. 22 lbs., shows the shape adapted for railway signal-posts; and fig. 3071,weighing 2 qrs. 4 lbs° that for the supports for the wires of the electric telegraph. For these purposesthe screw-points must be very useful, as independent of the economy of labor in putting them down bymerely screwing them into the ground, instead of digging holes to introduce the cross-loot, aB possibilityof injury to the banks would bo precluded; whereas at present there is always a liability of causing aslip
. Appleton's dictionary of machines, mechanics, engine-work, and engineering. 8072. Fig. 3070, weighing 3 qrs. 22 lbs., shows the shape adapted for railway signal-posts; and fig. 3071,weighing 2 qrs. 4 lbs° that for the supports for the wires of the electric telegraph. For these purposesthe screw-points must be very useful, as independent of the economy of labor in putting them down bymerely screwing them into the ground, instead of digging holes to introduce the cross-loot, aB possibilityof injury to the banks would bo precluded; whereas at present there is always a liability of causing aslip by disturbing uncertain ground, and admitting water in the Bides ol cuttings. 488 PILE, SCREW, AND SCREW MOORING. The cast-iron screw sockeVpoints, fig. 30G9, have recently been very successfully applied for the sup-porting posts or columns of timber-sheds and buildings for railway stations and other purposes. Fig. 3072 shows the applicability to smaller objects, and a tent-pin has been selected as the most familiar example, as it requires to be removed so frequently, and show
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Keywords: ., bookcentury1800, booksubjectmechanicalengineering, bookyear1861
