. Official proceedings . of the WatabPulp & Paper Company at Sartell, Minn., and the regularityof driving is plainly apparent. The steel piling in question wasfirst used in the construction of the cofferdams for the riverportion of the walls, and afterwards placed in permanent posi-tion as shown. It may be noted that the steel piling was pulledand re-driven in freezing February weather with the thermo-meter 30 degrees below zero. Photograph Xo. 32 gives a set of views of Dam Xo. 2at Aspinwall, Pa. It will be recalled that in January, 1907, bothdams Xo. 2 and Xo. 3 were undermined by the high w

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. Official proceedings . of the WatabPulp & Paper Company at Sartell, Minn., and the regularityof driving is plainly apparent. The steel piling in question wasfirst used in the construction of the cofferdams for the riverportion of the walls, and afterwards placed in permanent posi-tion as shown. It may be noted that the steel piling was pulledand re-driven in freezing February weather with the thermo-meter 30 degrees below zero. Photograph Xo. 32 gives a set of views of Dam Xo. 2at Aspinwall, Pa. It will be recalled that in January, 1907, bothdams Xo. 2 and Xo. 3 were undermined by the high waters,and that at Dam Xo. 3 especially the banks were also under-mined, houses and railroad tracks carried off and the damsseriously damaged, partly due to the use of dynamite to preventfurther damage to the banks and the property thereon. Steelsheet piling was driven along the upper face of the dam andalong the faces of the wing wall to prevent further underscour. Photograph Xo. 28 shows Dam Xo. 3 with the piling in. be B O ^ 2; _bc pcj

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