Engineering and Contracting . completed results. It was 500 600 700 SOO 900 lOOO MINUTE BY NOZZLE (COL. 6.) Fig. 4. hydrant being taken for one co-ordinate,,and gallons per minute for the other. These curves give convenient means ofstudying the general uniformity of resultsand for interpolating between the points-given in the summary tables. They alsa June 24, 1908. ENGINEERING-CONTRACTING 3^S furnish a complete graphical record of theresults which are shown in tabulated formon the data sheets. As many curves aswere consistent with clearness have beenplotted on one sheet, .and in general hy-dr
Engineering and Contracting . completed results. It was 500 600 700 SOO 900 lOOO MINUTE BY NOZZLE (COL. 6.) Fig. 4. hydrant being taken for one co-ordinate,,and gallons per minute for the other. These curves give convenient means ofstudying the general uniformity of resultsand for interpolating between the points-given in the summary tables. They alsa June 24, 1908. ENGINEERING-CONTRACTING 3^S furnish a complete graphical record of theresults which are shown in tabulated formon the data sheets. As many curves aswere consistent with clearness have beenplotted on one sheet, .and in general hy-drants of similar main dimensions will befound plotted —In the friction-loss tests the In the open-butt tests the mercury col-umn was read to the nearest lb. Theaverage pressure from the ten readingswould probably not be in error more lb. and in general not more than 0,1 the tests where the mercury column wasconnected to the 6-in. piezometer the U-gage error also enters, but in general this. coo 7111) 800 SUO 1000 1100 GALLONS PER MINUTE BY METER, (CORRECTED.) Fig. 5. nozzle pressures were read to the lb., which represented a little less thanone-quarter inch on the scale, and was,therefore, a very easily read division. Thefluctuations under ordinary conditions, dueto changes of pressure in the city mains,were less than one pound. When morethan this, the unusual readings and thecorresponding ones on the other gageswere thrown out. It may safely be as-sumed that the nozzle pressures were cijr-rect within one-quarter of a pound. .\tthe pressures worked at, this would meanan error in quantity of less than 1 percent. The U-gages in the later tests were readto the nearest lb.; in the earlier onesto the nearest lb., except for the verysmall losses, where somewhat closer read-ings were made. At the small losses therewas almost no vibration of the mercurycolumns, thus facilitating accurate read-ings. For the larger losses ca
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