OF ARTS AND SCIENCES. 



-i:> 



Time. 

 3:16 



3:21J 



3: 22 \ 

 3:23J 

 3:24£ 

 3:26} 

 3:27 



Thermopile out. No certain effect. 

 Thermopile in. 

 Effect uncertain. 

 Scale to right. 



« 



tt 



tt 



3 . 30^ 



3:31| 



3:33} 



3:34J 



3:35} 



3:36 



3:36f 



Effect uncertain. 



Scale to left. 

 << ■< 



Scale to right. 



Effect uncertain. 

 Scale to left. 



Temp, of Paraffin. 



o 

 130.0 

 130.4 ? 

 133.0 

 137.7 

 133.2 

 131.4 

 129.5 

 T2G.5 

 125.0 

 123.6 

 124.4 

 126.7 

 130.6 

 131.0 

 129.5 

 127.5 

 125.5 



This was the first set of observations made after a rather impor- 

 tant change in the apparatus, and shows lack of skill. The next 

 series, made the same day, is somewhat better. The same thermopile 

 was used, hut contact was during the latter part of compression, 

 just before admission of new steam, near the point K in Figure 5. 



Temp, of Paraffin. 

 iin effect. o 



124.1 

 125.0 

 124.9 

 125.0 

 127.0 

 126.2 

 125.2 

 124.6 

 124.0 

 123.5 



122.8 

 122.3 

 122.0 

 121.8 

 vsi:> 

 124.3 



While such observations as those just recorded were being made, 

 one observer was usually engaged in taking indicator diagrams from 



