282 Mr. T. Wedgwood^s Experiments and Observations , &c. 
instant of its disappearing, into cups of weighed water, of the 
temperature of between 211 and 212 0 of Fahrenheit: then, 
as any addition of heat will expand the water into steam, the 
loss of weight of each vessel will give an exact measure of the 
heat of the cylinders at the time of immersion. 
