OCR Text |
Show Charting River Bottoms. An Ingenious apparatus for drawlns the profile of u river bottom Is used by Ilallun engineers It consists of a wheel alibied to tho bottom of a gradu ated rod, which Is fastened vertically at tho side of a boat In such n manner that ns tho hnal advances up or down or across stroma tho wheel at tho end of tho rod ruus continually upon the bottom, tho rod rising and falling with variations of tho level Uy noting the depth at rho.M-n Intervals of tlmo tbe elements are obtained for tracing an nccurato representation of all tho sinuosities sinu-osities of tho bottom of tho river" and tho variations of depth. In tho wv-Ing wv-Ing of tlmo this slmplo apparatus possesses pos-sesses an enormous udvantngo nvei the ordinary method of soundings. |