. American engineer and railroad journal . irk,N. Y., at a cost varying from | to $ per square yard,and experience has shown tluu it stands well under heavytvattic. Vitrified brick is to be used extensively in pavingthe streets of Toledo, O. There is no doubt that goodbrick presents many advantages for street paving. The steel rail mills are not very busy at present, the rail-road companies having apparently held back their ordersfor the year as much as possible. There are few orders atpresent for rails for new construction, and while a largeijuantity will be needed for renewals, as us
. American engineer and railroad journal . irk,N. Y., at a cost varying from | to $ per square yard,and experience has shown tluu it stands well under heavytvattic. Vitrified brick is to be used extensively in pavingthe streets of Toledo, O. There is no doubt that goodbrick presents many advantages for street paving. The steel rail mills are not very busy at present, the rail-road companies having apparently held back their ordersfor the year as much as possible. There are few orders atpresent for rails for new construction, and while a largeijuantity will be needed for renewals, as usual, there is adelay in placing contracts. A BRIDGE of the Harman pattern is now in use at theWeed Street crossing of the river in Chicago ; it has a spanof CO ft., and another of 80 ft. span is to be built at theCanal Street crossing. As shown in the accompanyingsketch, this is a double-jointed bascule or folding bridge,an outer joint permitting the end of the lifting leaf or panelto fold back. This requires a peculiar arrangement of the. H.^EMAN-lIFTING BRIDGE, CHICAGO RIVEK counterweights. The advantages claimed for this form ofbridge are that it requires less counterbalancing than anordinary lifting bridge, is less likely to interfere with a shipsrigging, and offers less resistance to wind when open. Onthe other hand, it is somewhat more costly, and is neces-sarily less stiff than the ordinaiy lifting bridge of a singlespan. One of the largest floating cranes in existence is now inuse at the Cramp yards in Philadelphia ; it is at present era-ployed in placing the boilers, engines, and heavy armor-plates on the new cruiser Nexo York. It is of the usual formof these cranes, a mast rising from a floating pontoon andsteadied by a conical framework ; this mast carries a hori-zontal arm or boom on which the traveler carrying the loadworks. The capacity of this crane is rated at 125 pontoon is of iron and is braced and divided into com-partments by several bulkheads ; it
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
