32 
PROF. CALLENDAR ON VARIATION OF SPECIFIC HEAT OF WATER, ETC. 
If the specific heat were constant and equal to unity the value of <p would be 
2-30259 logio (;^ + 273-l)/273-l. 
The values of the specific heat, total heat, and entropy between 0° C. and 100° C. 
are for a constant pressure of 1 atmosphere. The values above 100° C. are for water 
under saturation pressure. The difference between saturation pressure and 1 atmo¬ 
sphere would not affect the values by 1 in 10,000 below 100° C. 
In conclusion, my best thanks are due to Mr. W. J. Colebrook, Superintendent of 
the Physics Workshop of the Imperial College, and to other members of the staff 
under his direction, for the great care and skill displayed in making and adjusting 
the platinum thermometers and other apparatus required for this investigation. 
