. The street railway review . ttempts to rise there it is suddenly chilledand prevented from flowing out on top of the the molds the crack between the halves isclosed by holding a pan of sand up against it. The (^tud/ll\aiWci^j^ylcW* 751 molds can be put on a joint in about two minutes. Assaid before the molds are hot when put on and they areallowed to stay on long enough to heat the rail the iron has been poured in about ten minutes isallowed to elapse before the molds are taken off and puton another joint. About a dozen sets of molds are keptin use at once. Every o
. The street railway review . ttempts to rise there it is suddenly chilledand prevented from flowing out on top of the the molds the crack between the halves isclosed by holding a pan of sand up against it. The (^tud/ll\aiWci^j^ylcW* 751 molds can be put on a joint in about two minutes. Assaid before the molds are hot when put on and they areallowed to stay on long enough to heat the rail the iron has been poured in about ten minutes isallowed to elapse before the molds are taken off and puton another joint. About a dozen sets of molds are keptin use at once. Every other joint of a section of track iscast in the morning and in the afternoon the remainingjoints are cast. This is to prevent, as far as possible, thesevere strain of contraction and expansion. When thethe joint is hot it heats the rail for some distance on eachside and consequently there is considerable is a corresponding contraction when the joint effects of this were feared enough so that the above. MOLUS ON JOINTS. method has been used to prevent the strain to someextent. The joint made at St. Louis weighed 120 joints can, of course, be made of any made by the company at first weighed 54 54-pound joint placed on blocks two feet apart haswhen tested stood a downward pressure of 100,000pounds. The 120-pound joint covers four material used is common cast iron with a secretcomposition therewith. The cast iron is selectedwith a view to great tensile strength. The cost of ajoint is about $3. In the engraving showing the wagon and force of menemployed on the work there are about eight who areemployed in the actual operation of running the cupolaand casting the joints. The rest are for digging up thepavement. Iron is unloaded along the street at theplaces where it will be needed. If it is found to stand the test of time this process willhave some marked advantages over electric the first pl
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
