[modeleng] Re: scottish inventions

Newcomen's was indeed an atmospheric engine - and so were the Watt & 
Boulton's, the difference being that instead of cooling down the cylinder on 
each stroke, Watt's separate condensor did the cooling.    At that stage it 
was difficult to produce a boiler that could withstand pressures of more 
than 2 or 3 lbs/sq in.   Watt was against higher pressures, and I believe 
that Trevithick was the first man to make a 'real' steam engine, operating 
on steam pressure, rather than atmospheric pressure.

Cheers!   Hubert

----- Original Message ----- 
From: "Jesse Livingston" <fernj1@xxxxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Friday, March 31, 2006 1:28 PM
Subject: [modeleng] Re: scottish inventions


> Newcomen's engine was not an actual steam engine if I recall correctly. 
> His
> idea was to draw in steam at atmospheric pressure, seal it in the cylinder
> and then cool it so it condensed and formed a vacuum which then pulled the
> piston and raised the pump rod in the mine
>
> Jesse, the Tennessean with the last name of Livingston which is lowland
> Scot.
>
> I believe that Watt made the improvement ot Newcomen's engine, by fitting
> the separate condensor, thus saving a huge amount of fuel.    Newcomen's
> first successful engine worked in 1712.
>
> Watt and Boulton produced a successful engine with a condensor in about
> 1773.
>
> Cheers!   Hubert
>
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