Ox THE MECHANICAL EQUIVALENT OF HEAT 



447 



the quantities 1 in 500. Hence, in drawing a curve through the results, 

 as given in the last column, I have almost neglected the Kew, and have 

 otherwise sought to draw a regular curve without points of inflection. 

 The figures in the last column I consider the best. 



Table LIII takes the mean values as found in Tables LI and LII, 

 and exhibits them with respect to the temperatures on the different 

 thermometers, to the different parts of the earth, and also gives the 

 reduction to the absolute scale. I am inclined to favor the absolute 

 scale, using ra= -00015, as given in the Appendix to Thermometry, 

 rather than -00018, as used throughout the paper. 



Table LIV gives what T consider the final result of the experiment. 

 It is based on the result ra= -00015 for the thermometers, and is cor- 

 rected for the irregularity of the engine by adding 1 in 4000. 



The minor irregularities are also corrected so that the results signify 

 a smooth curve, without irregularity or points of contrary flexure. 

 But the curve for the work does not differ more than three kilogramme- 

 metres from the actual experiment at any point, and generally coincides 

 with it to about one kilogramme-metre. These differences signify 

 0-007 C. and 0-002 C., respectively. The mechanical equivalent is 

 for single degrees rather than for ten degrees, as in the other tables. 



TABLE XXXVII. FIRST SERIES. Preliminary. 

 January 16, 1878. Jacket and Air about 14 C. 



