Schematic drawing of James Watt's 'Lap' engine, 1788.

 
Schematic drawing of James Watt's 'Lap' engine, 1788.
4 0 c m
 
36cm
actual image size: 28cm x 32cm

Description

Drawing made in 1912 by the Deutsches Museum, Munich. The first recorded steam engine was built in 1712 by Thomas Newcomen. James Watt was asked to improve upon a model of the engine, with his solution being a separate condenser, which he patented in 1769. This, and various other features, meant that Watt and his partner Matthew Boulton had an engine which was capable of driving machinery. This rotative engine was built to power a section of Boulton's own works in Soho, Birmingham. It was known as the Lap engine because it drove a number of metal polishing (or 'lapping') machines, and was the first engine ever to be fitted with a centrifugal governor to regulate its speed. The Lap engine is the oldest, essentialy unaltered Watt beam engine to survive intact.

© Science Museum / Science & Society Picture Library

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