34 
day, and there is an incredible advantage derived in the 
saving of coals, in the longevity of the boiler, and in increased 
safety to all parties concerned with it. In conclusion, Mr. 
Graham stated that his results had been arrived at with 
caution, the experiments had extended over a period of several 
years, received daily attention, and were deduced from 
several hundreds of recorded observations. 
An interesting and animated conversation followed the 
reading of this paper, in which Mr. Fairbairn, Dr. Joule, 
Mr. Dyer, Dr. Smith, Mr. Roberts, Mr. Curtis, Mr. Spence, 
Mr. Fothergill, Mr. Cawley, and others, took a part. 
