DAVIS. — THE LAW OF CORRESPONDING STATES. 



251 



which have been used as above to give the 33 values of the Joule- 

 Thomson coefficient which are presented in the following table. They 

 are plotted as circles with diagonal crossbars in Figure 6. The re- 

 duction factor in this case is 0.324, Griessmann's pressures being in 

 kilograms per square centimeter and his temperatures in Centigrade 

 degrees. 



10 20 30 40 50 60 70 80 30 100 110 120 130 140 150 160 170 180 130 200 2J0 220 



Absolute pressure in lbs. per square inch. 



Figure 4. Peake's throttling curves. From his paper in the Proceedings 

 of the Royal Society. 



Peake's experiments were carried out in the engineering laboratory 

 of Cambridge University in England and were begun in the fall of 

 1898. The appearance in 1900 of Grindley's work along almost iden- 

 tical lines at first inclined Peake to discontinue his investigation, but 

 a careful examination of Grindley's data as compared with his own, 

 led him to the discovery in both of the heat of gasification error already 

 mentioned and to its true explanation, and his experiments were con- 

 tinued with this particular point in view. His apparatus was there- 

 fore redesigned so as to bring the steam as quickly as possible from the 

 boiler to the orifice to avoid condensation on the way, and he, like 



