. Engineering and Contracting . t Topeka. As the stream-flow investiga-tions of the Geological Survey are closely related to theflood forecast work of the Weather Bureau, the two bureausplanned to cooperate in the installation of a long distancewater-stage recorder. With the receiving instrument locatedin the Weather Bureau office, a continuous record of theriver stage would be available at all times and the rapidityof the rise and fall during periods of high water and the prog-ress of flood crests could be determined readily from thegraphic record. Equipped witli Two Telephones with CaU Bells
. Engineering and Contracting . t Topeka. As the stream-flow investiga-tions of the Geological Survey are closely related to theflood forecast work of the Weather Bureau, the two bureausplanned to cooperate in the installation of a long distancewater-stage recorder. With the receiving instrument locatedin the Weather Bureau office, a continuous record of theriver stage would be available at all times and the rapidityof the rise and fall during periods of high water and the prog-ress of flood crests could be determined readily from thegraphic record. Equipped witli Two Telephones with CaU Bells for Streamnsas River at Topeka, Kan. The sending instrument at Topeka is located in a con-crete shelter over a reinforced concrete stilling well on theriver bank. It is connected to the receiving instrument bya pair of wires leased from the telephone company. Thesender is grounded and operates the receiving instrumentby means of these two wires and a ground return. Onecircuit telegraphs rising stages, the other falling Graph of River Stages on Kansas River at Topel<a, Kan., April 10-17, 1920, as Recorded by Receiving Instruments of Gurley Long Distance Water Stage Recorder. Current is supplied to these circuits from a 110-volt D. line at the Weather Bureau office. A phosphor bronze tape attached to a 21-in. diameter floatand counterweight passes over the sprocket wheel of thesender to which are geared two bent metal contact tubescontaining mercury. Each tube is divided longitudinally byan insulated partition having openings near the bent side of the tube connects with a ground wire, the (145) 648 Engineering and Contractiiu/ for June 9, 1920. other to a line wire. One tube operates on rising stage, theother on falling stage. As the float fluctuates up and downin the stilling well with the changing river stage, these con-tact tubes swing through small arcs and make electric con-tacts whenever the stage rises or falls one-twentieth of afoot. At that i
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