Engineering and Contracting . d work. Figure 2 shows themethod of jacking; the height to which it about ,33,000 cu. yds., so that the averagemontlily work done consisted of about10,000 cu. yds. of concrete. The work doneduring this period therefore about equalthe capacity contemplated. The greatestdays work of 20 hours was about 1,000cu. yds.; this was for day and night frequently 500 cu. yds of concretewere put in in 10 hours. It was found im-possible to keep up this gait all the time,for the reason that the machinery wouldrequire repairs and renewals, and becausetlie material men c
Engineering and Contracting . d work. Figure 2 shows themethod of jacking; the height to which it about ,33,000 cu. yds., so that the averagemontlily work done consisted of about10,000 cu. yds. of concrete. The work doneduring this period therefore about equalthe capacity contemplated. The greatestdays work of 20 hours was about 1,000cu. yds.; this was for day and night frequently 500 cu. yds of concretewere put in in 10 hours. It was found im-possible to keep up this gait all the time,for the reason that the machinery wouldrequire repairs and renewals, and becausetlie material men could not get the materialto us quickly enough. It was, however,necessary to have a plant of this capacityin order to make up for lost time when theopportunities presented themselves. Owing to the very unsatisfactory opera-tion of the law by which steam engineersare licensed, the use of steam power in thiscity is generally avoided by contractorswhenever possible to do so. For this rea-son the operation of the plant used on the. Fig. 2—Traveler After Being Jacked Up 15 ft. was lifted, as shown on this view, is about16 ft., which is about three times higherthan what is usually done. The travelershave sufficient number of derricks to per-mit the two classes of workmen—namely:the masons and the concrete men—to work-without interfering with one another. Theyare very heavy, weighing about 80 tonseach. The original idea was that theywould be lifted about 6 ft. at a time andthen moved forward on completed non-delivery of the anchor bars andgirders has caused a very material changein the method of executing the work, andthe occasion thereby arose by which it wasnecessary to lift the travelers 16 ft. The capabilities of the plant were veryclearly demonstrated in putting in theconcrete for the base of the anchorage;this contains over one-third of the con-crete to be put in Division No. i. Thiswork was started in the early part of Sep-tember and finished the early part of De-
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