TABLE SHOWING THE AVERAGE PRESSURE OF THE STEAM UPON THE PISTON THROUGHOUT THE STROKE, WHEN CUT OFF IN THE CYLINDER FROM TO, COMMENCING WITH 60 POUNDS AND ADVANCING IN 5 POUNDS UP TO 105 POUNDS PRESSURE. TABLE SHOWING THE AVERAGE PRESSURE OF THE STEAM UPON THE PISTON THROUGHOUT THE STROKE, WHEN CUT OFF IN THE CYLINDER FROM TO, COMMENCING WITH 110 POUNDS AND ADVANCING IN 5 POUNDS UP TO 150 POUNDS PRESSURE. Pressure in Pounds at the Commencement of the Stroke. 115 120 125 130 135 140 145 150 Average Pressure in Pounds upon the Piston. TABLE SHOWING THE TEMPERATURE OF STEAM AT DIFFERENT PRESSURES, FROM 1 LB. PER SQUARE INCH TO 220 LBS., AND THE QUANTITY OF STEAM PRODUCED FROM A CUBIC INCH OF WATER, ACCORDING TO PRESSURE. It is necessary to add the pressure of the atmosphere, 15 pounds, to the pressure on the steam-gauge, to correspond with the table. TABLE SHOWING THE TEMPERATURE OF STEAM AT DIFFERENT PRESSURES, FROM 1 LB. PER SQUARE INCH TO 220 LBS., AND THE QUANTITY OF STEAM PRODUCED FROM A CUBIC INCH OF WATER, ACCORDING TO PRESSURE. It is necessary to add the pressure of the atmosphere, 15 pounds, to the pressure on the steam-gauge, to correspond with the table. Explanation of the following Table. The first column gives the absolute pressure of the steam in inches of mercury, or the height to which the pressure would raise a column of mercury in a tube, provided the opposing pressure of the atmosphere were removed. The second column gives the absolute pressure in pounds per square inch under the same circumstances. The third column, it will be observed, is headed "Pressure above Atmosphere." By this is meant the apparent pressure of the steam as indicated by a steam-gauge. The fourth column shows the temperature in degrees of Fahrenheit's scale. The fifth column shows the increase of volume which the water assumes in the act of changing into steam. The sixth column shows the velocity with which steam, at the given pressures, escapes through an orifice into the atmosphere, as, for example, through the safety-valve of a steam-boiler. TABLE OF THE ELASTIC FORCE, TEMPERATURE, AND VOLUME OF STEAM FROM A TEMPERATURE OF 32° to 457° Fah., and FROM A PRESSURE OF 0.2 TO 900 INCHES OF MERCURY. |