7 
Steam Engine. 
other of which is in common use in Great-Britain, and 
either of which will answer the purpose. A steam engine 
of the power of a dozen horses, need not, and ought not, 
to send forth so much smoke as a common sitting room 
fire : the method of producing this effect, is not a tax 
upon the owner, but an advantage ; for he consumes his 
fuel more perfectly, and none goes to waste. If steam 
engines continue to be erected in large towns, without 
having this improvement attached to them, instead of 
being as they might be, blessings to the neighbourhood, 
they will make our towns uninhabitable ; and I would 
earnestly recommend that the legal question of nuisance 
should be settled, by an indictment brought against the 
offenders. 
Specification of the Patent granted to Mr. James Watt, 
of Birmingham^ in the County of Wamvick^ Engineer ; 
for certain newly-improved Methods of constructing 
Furnaces or Fire-places^ for heatings boiling, or evapo- 
rating of water, and other Liquids ; which are applica- 
ble to steam-engines and other purposes; and also 
for heating, melting, and smelting, of Metals, and their 
Ores ; whereby greater effects are produced from the 
Fuel, and the smoke is in a great measure prevented, 
or consumed. 
Dated, June 14, 1785. 
TO all to whom these presents shall come, &c. Now- 
know YE, that, incompliance with the said proviso, and 
in pursuance of the said statute, I the said James Watt, 
do hereby declare, that the following is a particular des- 
cription of the nature of my said invention, and in what 
manner the same is to be performed ; that is to say, my 
said newly-improved methods of constructing furnaces or 
fire-places consist in causing thf smoke or fianie of the 
