By the end of the 17th century, the mine companies strongly needed new
powerful pumps to extract water out of the mines. Many engineers managed to
persuade prosperous company owners in favor of their projects, which were
often unrealistic and unrealizable. The distrust in such engineers grew, and
in 1702 Thomas Savery had serious problems when he published a script in
which he described the advantages and the mode of operation of an engine
that would transport water out of mines easier. He called his script The Miners Friend. His goal was not to make unrealistic promises. He wanted to explicate
to people how his engine worked. Society would then decide whether or not
his engine is worth building.
You can study the mode of operation of his engine with the following java
animation. Of course the power of the engine, which can be seen in the
height of the maximum lift of water, depending on the pressure of the
boiler. Although Savery had promised commendable results, the engine was not
able to be used for pumping purposes. The mines were too deep; engineers
were not capable of building boilers that could bear such a high pressure.
Another problem was bad efficiency. The steam was always in touch with the
cool water of the mine. Further, the same space had to be cooled and heated
up again. The boilers were to diminutive, so more than just one boiler was
needed to transport the water out of the mines. The largest engine was used
in the waterworks of London.
Click the buttons on the right side to change the speed of the animation.
NEW!: Because of the some Problems with some Browsers we decided to do a Quicktime-Movie of the Java-Animation. You can get it here:
savery-e.mov (911 kB, Quicktime-Movie)
Thomas Savery's pump engine
First of all, the receiver gets completely filled with steam. When the
connection to the boiler is closed and the receiver has already cooled down,
a negative pressure occurs, which sucks water into the receiver as long as
the valve (1) is opened. Now, valve(1) closes and valve (2) opens. The
pressure of the steam of the boiler presses the water through the open valve
3 upward. Later, versions of the engine used an additional receiver to pump
water all the time.
An interesting detail: Savery was the first who used the unit
"horsepower". He compared the power of his engine to the power of about 10
Conrad Matschoss - Die Entwicklung der Dampfmaschine
Robert H. Thurston - The growth of the steam-engine (online)
F.Calcagno & S.M. Calizzano - Steam engines (online)
Links about "Savery"|
A History of the growth of the steam-engine
Language: English | Rating: 4.937 | Hits: 7094 | Status: broken? | founder: sye
A History of the growth of the steam-engine. Almost everything about the development and the history of steam-engines.
Language: English | Rating: 4.780 | Hits: 8260 | Status: broken? | founder: sye
The events and the men who led to the steam engine invention, with animations, diagrams and pictures.
The Miners Friend
Language: English | Rating: 4.960 | Hits: 803 | Status: broken? | founder: sye
The Miners Friend or, an engine to raise water by fire by Thomas Savery
Savery art down through the afes
Language: English | Rating: 4.823 | Hits: 251 | Status: broken? | founder: other
Robert Savery artist/illustrator/landscape design/landscape architect
Language: English | Rating: 4.616 | Hits: 465 | Status: broken? | founder: other
Thomas Savery and his great invention
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