Engineering et de passation . 0,67 sur 1 S 3.15 5.S5 .5.4 à n.37 0 680,94 1 131,28 1,14 0,72 3,00 6,00 6,0 à 0,37 0,70 0,97 1,17 00 1,35 1,20 0,77 00 ? 2.S5 6,15 6,6 0,72 0,99 0,3 s (10 1,20 1,41 1,27 0.^2 non ? 4. 2,70 6,30 0,38 0,73 7,2 1,01 1,22 à 1,47 1,33 0,85 2,55 6,45 00, Kfi 7,8 0,39 0,73 1,02 1,23 à 1,51 1,39 0,90 2,40 00 !1S 6,60 0,40 0,74 8,4 1,03 1,24 n 1,56 1,45 0,94 00 3.0. 2,25 6,75 0,40 0,74 1,03 9,000 1,25 1,61 1,50 0,98 00 UNE NOUVELLE DÉCHARGE CONVERTIBLE MIXER. Une nouvelle décharge convertible bétonnière a beenplaced dans le marché récemment par le CementMachinery Waterloo

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Engineering and Contracting . 0.67 on 1 S 3.15 5.S5 .5.4 on n.37 0, 68 0.94 1, 13 1.28 1.14 0.72 on SO 3.00 6.00 6.0 00 0.37 0.70 0.97 1.17 1.35 1.20 0.77 00 ? 2.S5 6.15 6.6 (10 0.3S 0.72 0.99 1.20 1.41 1.27 0.^2 no ? 4. 2.70 6.30 7.2 on 0.38 0.73 1.01 1.22 1.47 1.33 0.85 00 Kfi, 2.55 6.45 7.8 on 0.39 0.73 1.02 1.23 1.51 1.39 0.90 00 !1S 2.40 6.60 8.4 no 0.40 0.74 1.03 1.24 1.56 1.45 0.94 00 3.0. 2.25 6.75 9.0 00 0.40 0.74 1.03 1.25 1.61 1.50 0.98 00 A NEW CONVERTIBLE DISCHARGE MIXER. A new convertible discharge concrete mixer has beenplaced in the market recently by the Waterloo CementMachinery Corp. of Waterloo, la. This machine is so ar-ranged that it can discharge at the front, the rear, oron either side, without disturbing the trucks or movingit any direction. This is accomplished by removing fourbolts in the turntable which is mounted between thetruck frame and the I-beam frame of the machine. Afterturning the mixer frame with the chute pointing to anyone of the four sides on which it is desired to discharge, . Four Positions of Discharge of New Mixer. the bolts are replaced and securely tightened, thus rig-idly bolting the mixer- frame to the truck frame, and themachine is again i-eady for business. The change canbe made in less than 10 minutes. The accompanyingillustration shows the four positions of discharge. According to the Portland Cement Association, theroads, .streets and alleys that have been placed under con-tract during the present year to be built of concrete, totalnearly 23, 000, 000 sq. yd. Owing to many unfavorableconditions in the labor world, much of this work will carryover into next season. If the disturbing influences thathave prevailed this year are absent in 1917, no doubt thenew year will be a record one. Water Works and Hydraulics Issue of Engineering and Contractini Halbert P. Gillette, President and Editor Volume XLI. CHICAGO, ILL., DECEMBER 13, 1916. Number 24. SOME COMMENTS ON LETTERS FROM CORRES-PONDENTS RELATIVE TO THE UNION OFWATER

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