Water pressure engine Mr William Westgarth's statical hydraulic engine 1769 Sectional elevation, scale 1:96 Valve scale 2:1 Ink wash (1787) Inscribed in the hand of John Farey 'Mr William Westgarth of Colecleugh, Northumberland, invented a new hydraulic engine for draining mines, and erected one in 1765 for a lead mine belonging to Sir Walter Blackett at Colecleugh. Mr Westgarth sent a model to the Society of Arts and Mr Smeaton wrote a strong recommendation of his plan dated 29th April 1769 (See Printed Reports II.376). The Society gave Mr Westgrth 50 guineas and published a description, see Bailey's Machines I.192 and II.52. But that description being insufficient, Mr Smeaton in 1787 drew up a paper and made the following drawings for the Society: He was presented with their silver medal for the communication which is printed in their transactions for that year, Volume 5, page 179. See a similar valve on folio 162. The description is printed in Trans Arts V 185' 1769