Canadian engineer . ned withcounterforts. Both sections are reinforced with a doublesystem of rods. When the structure has taken a more finish-ed appearance the earthwork will receive a coating of mac-adam pavement and by this means there will be completeda substantial road bed over ihe entire traffic way. The costof this viaduct is estimated at $25,218. The contractor wasMr. C. E. Lewis, of Toronto, and the work was designedin the bridge department of the city engineers office. A WIND=DIRECTION RECORDER. The wind-direction recorder which is shown in the ac-companying figure, and was described
Canadian engineer . ned withcounterforts. Both sections are reinforced with a doublesystem of rods. When the structure has taken a more finish-ed appearance the earthwork will receive a coating of mac-adam pavement and by this means there will be completeda substantial road bed over ihe entire traffic way. The costof this viaduct is estimated at $25,218. The contractor wasMr. C. E. Lewis, of Toronto, and the work was designedin the bridge department of the city engineers office. A WIND=DIRECTION RECORDER. The wind-direction recorder which is shown in the ac-companying figure, and was described in a recent issue ofLondon Engineering, forms an example of a singularlysimple solution of an awkward problem. The instrument,as will be gathered, consists of a Pen which moves in a ver-tical,plane, and traces a recording curve on the surface of arevolving drum. The pen is driven from a cam which isconnected up to and actuated by a wind-vane, while the drumis driven by self-contained clockwork. The wind-vane is not. Diagrammatic Sketch of Recorder. shown in the figure. It is mounted at the top of the verticalspindle, which is made of such length as may be necessaryto enable the vane to be situated in an exposed positionabove the building in which the instrument is placed. Wind-direction recorders of other types than the present have, ofcourse, been constructed. In one of these the chart is con-nected to the drum, and the pen is driven by clockwork,while others use two pens in various ways. The advantageof the present type lies in its extreme simplici/ty and in thefact that the movements of the pen are vertical and thecharts rectilinear. It is obvious that an instrument havinga simple and continuous groove in the cam could not beconstructed on the lines of the figure, since with backing andveering winds the vane, after making a complete revolution,would cause the pen to so alter its zero in reference to thechart that the readings would become meaninarless. In otherwords, if the
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishertoron, bookyear1893
