Engineering and Contracting . ry.—By Ernest H. Sprague. Scott, Green-wood & Son, London; D. Van Nostrand Co., New York, Distributors;Cloth; 414x7 in.; 163 pp.; illustrated; $ This is an English work treating of earth and waterpressures on walls and other structures and of the sta-bility of such structures. A very full treatment of thesubject is given, in which graphical methods predom-inate. STEEL TRAVELER AND FORMS FOR RETAININGWALL CONSTRUCTION. A retaining wall approximately 28 ft. high carries,along a side hill near Paw Paw, W. Va., the tracks of thenew Magnolia cutoff of the Baltimor
Engineering and Contracting . ry.—By Ernest H. Sprague. Scott, Green-wood & Son, London; D. Van Nostrand Co., New York, Distributors;Cloth; 414x7 in.; 163 pp.; illustrated; $ This is an English work treating of earth and waterpressures on walls and other structures and of the sta-bility of such structures. A very full treatment of thesubject is given, in which graphical methods predom-inate. STEEL TRAVELER AND FORMS FOR RETAININGWALL CONSTRUCTION. A retaining wall approximately 28 ft. high carries,along a side hill near Paw Paw, W. Va., the tracks of thenew Magnolia cutoff of the Baltimore & Ohio R. R., closeto the main line tracks. To construct this wall and notinterfere with traffic on the main line a traveler and steelform were used, as illustrated. The difference in level ofthe two lines is 28 ft., so that this is the neat height ofthe wall, but at places the wall footing extended 11 the neat line level. The wall is of concrete ofgravity section and the traveler handled all concrete and. Traveler and Forms for Concrete Retaining Wall Construction. all excavation from the footing trench and also carriedthe wall forms. The illustration shows the general construction of thetraveler. It was 50 ft. long and 35 ft. high, and as itstraddled the main tracks it was 34 ft. wide. On oneside a cantilever extended the traveler platform over the wall. An 80-lb. rail on each side of the main tracksformed a traveler track. Three trucks of four tandemwheels each on each side of the traveler rode on thetraveler track, the traveler being moved ahead by linesfastened ahead to deadman. On the traveler weremounted two stiff-leg derricks separately engined. Thesederricks handled the excavation and the concrete. Con-crete mixed at a central plant about one-half mile awaywas brought on a service railway in buckets on cars; thebuckets were handled by derrick and emptied throughholes in the cantilever platform. This platform alsocarried by suspension the steel forms. They
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