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54 THE MARINE REVIEW ce erie YOM SNONULLUO. W¥L: re | February, 1912 Fic. 2--ELevation AND TypicaL SEcTION oF New Two Hargors Dock. The slope of the ore pockets is 4714 degrees. The ends of the bins ate made of semi-circular steel plates. This design not only adds to the stiffness of the structure and reduces the amount of steel necessary, since no framing is required to resist the outward pressure of the ore, but also aids greatly in the rapid operation of the dock. The curved surfaces are effective in breaking up the arching of the ore body which frequently oc- 'curs and impedes the movement of the material. This design reduces poking to a minimum. "ie dock js 1900" ft. 7%. in; in length from end to end of crib and the distance from the center of the first bent in the dock proper to the final bent at the outer end of the end tower is 1,856 ft. 7%4 in. As stated, there are 151 pockets on each side of the dock, spaced 12 ft. centers according to standard practice. From the mean water level of Lake Su- perior to the base of the rails in the tracks on the top of. the dock, the height is 75 ft. and the width of the dock, exclusive of machinery plat- forms, is 62 ft. 6 in. The structure is, therefore, 1 ft. higher and 10 ft. 10 in. wider than the new Duluth & Iron Range railway dock described in this article. The height from water level to hinge of spout is 40 ft. Six of the largest vessels on the lakes may be loaded at this dock at one time. The mechanism for hoisting the spouts is similar to that installed on the Duluth & Iron Range dock. The doors are of the usual type, but rad- ical changes have been made in the design of the spouts. They are rect- 'angular in section and tapered. The general nature of the foundation is indicated in Fig. 5. Under each side of the dock rows of piling are driven spaced approximately 2 ft. 5 -in. be- tween centers, there being seven piles driven 214 ft. apart in each row. The two groups of piling are enclosed in two parallel timber cribs, the outside walls of which are sand-tight. At intervals of approximately 28 ft. 9 in. the two parallel cribs are tied together by four 10 x 12-in. timbers, \-- ---_ - -- - --_- Timber Approach- - -- - Fea eae a - -- - ---- - -- - ----- -Stee/ Approach 63'0"-- ' vi avenal ee Dock Proper 2 Fig. 3--ELEVATION oF STEEL AND TIMBER ApproacHEs or NEw Dock at Two Harsors