. Canadian engineer. back. The top of the bin is now at about the same elevationas the top of the slope on which runs the constructionrailway. The trestle is to be built to the same level be-tween the bin and the slope, so that cars can be broughtout from the construction railway and dumped directlyinto the bin. Two 2-yard Ransome mixers are to be installedunder the bin. They will be fed direct from the bin and r mMi K^^l mSl^ *E!^f*H^fc-s-^| ^k^^kNS^rMv^^ ^H^AMK Fig. 3.—Hauling Bin Over Uneven Ground. will feed direct into buckets on the concrete trains. Theconcrete trains will run through th
. Canadian engineer. back. The top of the bin is now at about the same elevationas the top of the slope on which runs the constructionrailway. The trestle is to be built to the same level be-tween the bin and the slope, so that cars can be broughtout from the construction railway and dumped directlyinto the bin. Two 2-yard Ransome mixers are to be installedunder the bin. They will be fed direct from the bin and r mMi K^^l mSl^ *E!^f*H^fc-s-^| ^k^^kNS^rMv^^ ^H^AMK Fig. 3.—Hauling Bin Over Uneven Ground. will feed direct into buckets on the concrete trains. Theconcrete trains will run through the trestle at a pointdirectly below the position of the boom of the McMylercrane shown in Fig. 4. The trestle itself and the sub- April 6, 1916. THE CANADIAN ENGINEER 413 structure carrying the bin is built of piles driven about10 feet to refusal. The trestle is built on the bottom ofthe canal below Lock No. 2. The work being carried on at Lock No. 2 is part ofsection 2, of which Messrs. Baldrv, Yerburg;h and Hutch-. Fig. 4.—Showing Steepness of Incline onto Trestle, whichis the Final Location of the Bin. inson are the contractors and Mr. H. M. Balfour theresident engineer under Mr. J. L. Weller, , engineer-in-charge for the Department of Railways and Canals. THE USE OF DREDGES IN EXCAVATING OPENDRAINAGE DITCHES. SOME practical notes from a paper read before theIowa State Drainage Association by A. L. Golden-star, of Mankato, Minn., will be of interest toengineers in this country inasmuch as the employ-ment of dredges for the work has received very littleattention here. The use of dredges has influenced thedesign of the ditch to some extent. Engineers havespecified a cross-section which can be efficiently handledby the machine. It usually has been a section with ratherwide bottom and steep side slopes. Side slopes of 3^ to1 have been very common and some have been evensteeper. The arguments in favor of such a section havebeen that the sides were expected to cave down and
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