Public works . med tolubricate the concrete, causing it to be more easilymixed, chuted and worked. The concrete produceda smaller amount of laittance than is usual andhoneycombing is almost entirely absent from thedam. The stone was taken from the city quarry with noexpense other than that of actual quarrying. Foreach blast, two large well drillers were used to putdown about 10 holes 12 feet apart and 85 feet deep,located parallel to and 20 feet back of the quarryface. Three large blasts, each requiring about 4,200pounds of dynamite, made at different times as thework progressed, were required
Public works . med tolubricate the concrete, causing it to be more easilymixed, chuted and worked. The concrete produceda smaller amount of laittance than is usual andhoneycombing is almost entirely absent from thedam. The stone was taken from the city quarry with noexpense other than that of actual quarrying. Foreach blast, two large well drillers were used to putdown about 10 holes 12 feet apart and 85 feet deep,located parallel to and 20 feet back of the quarryface. Three large blasts, each requiring about 4,200pounds of dynamite, made at different times as thework progressed, were required to throw down thenecessary 45,000 yards of rock. After each shot,considerable secondary drilling was done by variouskinds of drills, and tripod and jackhammer, besidesa large amount of mud capping, in order to reducethe stone to steam shovel size. The air used by thedrills was piped from a power plant located belowthe dam. A %-yard Erie shovel used at the begin-ning of the job soon proved insufificient and was. BINS. .MIXEU TOWEIi .\T L,EFT BACKGROUND; FACE FORMS TEMIOIIARILY BRACED IN POSITION replaced by a 90-ton Marion shovel for loading thestone into dump cars. The cars were hauled a half mile to the dam overa 36-inch gauge track by an 18-ton dinkey, four carsconstituting a train. As the track approached thedam, it was elevated on a trestle at per centgrade, permitting dumping directly into a 1,500-tongyratory crusher. A hoisting engine was used tospot the cars up the incline to the front of thecrusher, which enabled the locomotive to return foranother train while the first trainload was beingdumped and crushed. From the crusher the brokenstone was raised to an overhead bin by means of abelt conveyor. The stone bin has a capacity of 1,000cubic yards and is located between the two sand bins. (70 be conliimed) Dallastown Asphalt-ConcreteHighway Construction of about miles of sheet asphalt pavement on cementconcrete base with concrete curb and gutter. D
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectmunicip, bookyear1896
