Whitelaw's Reaction Turbine or improved Barker's Mill

Whitelaw's Reaction Turbine or improved Barker's Mill and 1 long box spanner and 1 forked connecting rod.

This is an improved form of the reaction turbine known as Barker's mill (see inv. 1915-318), and was patented by Messrs. J. Whitelaw and J. Stirrat in 1839 and 1841. It was known as the Scotch turbine, and was largely used in the middle of the 19th century, but had by 1925 been superseded by more efficient types. The feature of the machine is the use of spiral arms, while the water enters the centre of the turbine from the upturned end of a fixed pipe. By these means the frictional and eddy losses are reduced and the efficiency is increased somewhat over that of the simple Barker's mill.