. American engineer and railroad journal . normal, an automatic correction device is included to compen-sate for the error thus introduced on the instrument set for aconstant pressure. This consists of a hollow spring similar tothe pressure spring in the steam gauge and is connected so asto be influenced by the static pressure of the steam at a point To /.czz/ePUj:t Ccrrect/nn tVe/^MC/ock. FIG. 3- where the flow is being measured. The movement of this springactuates a small correction counterweight and permits an accu-rate record being obtained for any rate of flow under varyingpressure. An in
. American engineer and railroad journal . normal, an automatic correction device is included to compen-sate for the error thus introduced on the instrument set for aconstant pressure. This consists of a hollow spring similar tothe pressure spring in the steam gauge and is connected so asto be influenced by the static pressure of the steam at a point To /.czz/ePUj:t Ccrrect/nn tVe/^MC/ock. FIG. 3- where the flow is being measured. The movement of this springactuates a small correction counterweight and permits an accu-rate record being obtained for any rate of flow under varyingpressure. An instrument which will indicate, but not graphically record,the rate of flow of steam or air is shown in Fig. 4. This in-strument is arranged on the principle of a float on the surfaceof the mercury in a U shape tube, which actuates a pulley thatin turn moves a small U magnet. This magnet affects an indi-cating needle mounted in a separate cylindrical casing and reg-isters on a calibrated dial, as shown in the illustration. These instruments, since their introduction a short time ago.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
