74 
PROCEEDINGS 1839—1840. 
general use in Cornwall, and consequently styled the Cornish boiler. 
The author considered the latter more economical, but also expressed 
an opinion that there was more danger in its use, because the internal 
flue was found to collapse ; this he attributed in a great measure to 
carelessness, the supply of water was interrupted and the flue 
became red hot and collapsed, or water was admitted and caused 
an explosion. 
]\Ir. J. Garth Marshall stated that he was convinced of the 
superiority of the Cornish boiler, and had erected boilers of that 
shape. He suggested that greater strength might be obtained by 
staying" them. 
The Rev. Theo. Barnes said that the improvement found in the 
Cornish boiler was due to Mr. Hornblower. It was at first doubted 
that his invention would affect the saving that he predicted, and 
many were reluctant to try it, upon which he made proposals to put 
up the boilers at his own cost, and to take 10 per cent, annually upon 
the increased profits, the quantity of work done being registered by 
a counter. When he returned at the end of a year, it was found that 
the profits had really been very gTeat, for they had been enabled to 
work mines that had been previously abandoned ; and as the mining 
proprietors did not like to pay him such large sums as the original 
agreement would entitle him to, a fresh arrangement was made by 
which they were at liberty to use his invention on payment of a 
definite sum. 
Mr. Charles Morton rose to suggest that as in Yorkshire no man 
knew what his neighbours were doing with respect to the fixing of 
their steam boilers, the form of their boilers, or the work their boilers 
can do, that it would be an advantage if some system like that pur- 
sued in Cornwall were adopted. The statistics of the Cornish engines 
were generally very complete, and he would therefore suggest that 
returns should be made by the coal-owners and others, of the form 
and construction of their boilers, their mode of firing, the number of 
horses' power of the engine, the quality and quantity of the coal con- 
sumed, the cost of working, the quantity of work done, and the 
amount per annum that it cost to keep the boiler or engine in repair, 
and the circumstances under which accidents occur. This might be 
