Demonstration apparatus, known as Barkers mill

This apparatus, known Barker's mill, was made in England in the late 19th century. It is unsigned. It is named after Dr John Barker, who invented the water turbine.

In the apparatus, the combined force of the water (being provided through the tube from the right) escaping from the four jets causes the brass vessel to rotate.

This was also known as the 'hydraulic tourniquet', and Baker's invention was demonstrated in model form to the Royal Society in 1743 by John Desaguheis (1683-1744), the famous lecturer and populariser of science.

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Online ID:	000-100-104-188-C
Image Rights Holder:	National Museums Scotland
Project:	0098: National Museums Scotland Project description \| View all records in project
Ref:	National Museums Scotland T.1902.49.74
Date:	Late 19th century
Material:
Dimensions:
What:	Barker's mill
Subject:	22. PHYSICS, Magnetism and Electricity (Departmental Classification) 13. HYDRAULICS, Waterpower (Departmental Classification)
Who:	Dr Barker (Eponym)
Where:	England
Event:
Description:	Barker's mill, unsigned, English, late 19th century
References:	Turner, G. L'E., Nineteenth Century Scientific Instruments. London: 1983, p 88
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