KODUCTi 



HEAT or VAPOHI/ATION. 



French units, r 98 - O.27/ r - 300 - o.8l 



units, r - 176 - o.27(/ -32) f - 540 - 0.8 (I - 32 



SPECIFIC HEAT or THE LIQUID. 



ftULFHUR DJOTOPB. AMMONIA. 



c - 0.4 c - i i 



Tables X and XI were calculated by aid of the equations written, and 

 may be of use for approximate calculations, in default of more reliable 

 let, 

 Other Data. For commit m < the following data are assembled: - 



tfh of the metre in inches . . 39-37- 



ht of the kilogram in pounds 2.2046. 



Weight of : 1 1 3 . 5959 kilos. 



One horse power, in foot pounds per second . . 550. 



Ckewl A vafirur, in kilogram met res per second 75. 



760 mm. of mercury. 



Normal pressure of the atmosphere 



>o.333 



14.7 IDS. persq. in. 



2116 Ibs. persq. ft. 

 29.921 in. of mercury. 

 One inch of mercury is equivalent to 0.4912 pound. 



Absolute temperature of freezing-point o 



Mechanical equivalent of heat. } 4^7 meter-kilogrmins, 



C 778 foot-pounds. 



Explanation of Tables. - Table I. which in a sense is the fundamental 



table for Knglish unit-, ha- been computed by the proper equations and 



methods as already explained, for each degree Fahrenheit; and may be 



relit d upon to have no errors of calculation greater than half a unit in the 



icant figure. The proper degree of accuracy to be attributed to 



any prop* be judged from the precedi: nents of data and 



i*. In general, attention has been given to this matter, 



>roj>erty being -tnted with the degree of accuracy considered proper, 



avoiding superfluous figures; an exception will be found in the earlier 



