Public works . nd the other one in-clined parallel to the battered face of the wall, andboth of them essentially lattice girders. Thesegirders are connected by a transverse cap or topgirder 19^^^ feet long and 5 feet 3 inches deep, underwhich there is clearance for the completed wall anda form between the side pieces. - The outer members of the side pieces have tele-scopic vertical bottom extensions to support theweight of the tower and the suspended form fromthe rock bottom. The rods suspending the form from the top ofthe tower are pivoted to swing transversely, givingabundant lateral displac
Public works . nd the other one in-clined parallel to the battered face of the wall, andboth of them essentially lattice girders. Thesegirders are connected by a transverse cap or topgirder 19^^^ feet long and 5 feet 3 inches deep, underwhich there is clearance for the completed wall anda form between the side pieces. - The outer members of the side pieces have tele-scopic vertical bottom extensions to support theweight of the tower and the suspended form fromthe rock bottom. The rods suspending the form from the top ofthe tower are pivoted to swing transversely, givingabundant lateral displacement for the forms, whichare adjusted and securely braced in position by top,bottom and intermediate connections on each side,which are pivoted to toggle joints built into the towerand operated by screw adjustments above waterlevel. By these devices the sides of the form canbe accurately set in the exact required position andrigidly maintained there while the form is in service. April 1, 1922 WORKS 223. UPPER PART OF TOWER WITH FORM ADJUSTABLYSUSPENDED BELOW WATER LEVEL. after which the adjustments can be slacked off, strip-ping the form from the concrete and providingclearance for its removal with the tower. The tower is supported from therock bottom at the four corners about27 feet apart transversely and 18^2feet apart longitudinally, the verticaladjustments of the bearings being madeby bolting the telescopic pieces in dif-ferent positions or by the jackscrewsfor small displacements, or by a com-bination of both methods. EXCAVATION AND PREPARATION At the commencement of operationsa trench about 30 feet wide and 10 feetin maximum depth was excavated inthe lake bottom by a dipper dredgeremoving all the material that it couldconveniently handle down to the sur-face of the rock. The surface of the rock was thenvery carefully mapped and profilesconstructed by means of soundings 6inches apart on the front and backlines of the wall and across the endsof the section. The sou
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectmunicip, bookyear1896
