Calibration of the pitot tube . the top of the pipe is about 5 l/?.below the ground. This accounts for the apparatus be ing sur-rounded by banks of clay on all sides. The weather during theexperiments was quite rainy andgave considerable trouble by water draining into the hole,sometimes to a depth of 3 or 4 feet betvfeen experiments. How-ever, a small hole was dug at one end of the large hole viiichwas deeper than any other pait and the water was kept bailedout of this hole thus keeping the surface of the pipe dryduring an experiment. Tube () is nearest the holder and () \sfour
Calibration of the pitot tube . the top of the pipe is about 5 l/?.below the ground. This accounts for the apparatus be ing sur-rounded by banks of clay on all sides. The weather during theexperiments was quite rainy andgave considerable trouble by water draining into the hole,sometimes to a depth of 3 or 4 feet betvfeen experiments. How-ever, a small hole was dug at one end of the large hole viiichwas deeper than any other pait and the water was kept bailedout of this hole thus keeping the surface of the pipe dryduring an experiment. Tube () is nearest the holder and () \sfour feet from The thermometer for mea;.uring the temper-ature of the gas is at (T) midv/ay between the tv© tubes. Anffisdifferential draft gauges were used for obtaining the velocityheads. They are seen at (a) and (b). Gauge marked (a) is fortube and B for The rubber tube leading to t^E lefthand end of the gauge (the larger end) is from the pressuretube; the rubber tube leading to the right hand or srr^ill end cf. ^ 6. the gaup;e is from the comlDined pressure and veloc it tube. The pressure gau/res are at C and D» C is fcr and Dis for C is connected to the velocity tube of andregisters the velocity plus the pressure heads. connectedto the pressure tube of and registers the pressure Ib ad . The Pitot tubes are placed in stuffing boxes and c an bemoved diametrically across the pipe. Ey Beans of the pointerseen near the top of the tube and a scale held on the pipeperpendicular to it the nozzle can be placed at any desireddistance from the center of the pipe. The pointer was previously set parallel to the horizontalbottom part of the tube ( the part containing nozzle), andmarks made on the cap and tube to make sure it remained inposition. The direction of the nozzle could then be determinedby the direction of the pointer. The accompanying drawing shov/s a section taken through thecenter line of one of the tubes and stuffing box. The in
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Keywords: ., bo, bookcentury1900, bookdecade1900, bookidcalibrationofpit00dref
