. Economic Papers. Mote:* MaAe bu/J wtiee/ ofJ/aye/3 //# p/a/?Af J:0* 2/cry&rj 5£*<dfom, •5ft Bull Y/bed-Ift Drum. 5JDE V/ELW 2 wh FzoriT y/el vy Fig. 4.—A portable pile-driver. - —s + i P =safe load in of hammer in pounds,h =height of fall in feet. s =penetration or sinking in inches under the average of the lastthree blows. Piles should be ten to twelve inches in diameter at the butt and not 18 CULVERTS AND SMALL BRIDGES FOR less than six inches at tiie point. In driving an iron hoop should beused at the top to prevent splitting and brooming. Ordinary pine pile
. Economic Papers. Mote:* MaAe bu/J wtiee/ ofJ/aye/3 //# p/a/?Af J:0* 2/cry&rj 5£*<dfom, •5ft Bull Y/bed-Ift Drum. 5JDE V/ELW 2 wh FzoriT y/el vy Fig. 4.—A portable pile-driver. - —s + i P =safe load in of hammer in pounds,h =height of fall in feet. s =penetration or sinking in inches under the average of the lastthree blows. Piles should be ten to twelve inches in diameter at the butt and not 18 CULVERTS AND SMALL BRIDGES FOR less than six inches at tiie point. In driving an iron hoop should beused at the top to prevent splitting and brooming. Ordinary pine pileswill cost from 12 cents to 20 cents per lineal foot delivered at the jobin most sections of the State. In ordinary soil the cost of driving shortfoundation piles should not exceed $1 each. Pile driving is often a troublesome matter on small isolated jobs, andthe portable pile driver illustrated in* Fig. 4, p. 17, will prove conve-nient if much work is to be done. This driver is operated by a rope running through a snatch block atthe top and around the drum. Another rope wound around the bullwheel is hitched to a horse.
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