Paper, 'A description of an engine to raise water by the help of quicksilver, invented by the late Mr Joshua Haskins; and made practicable and usefull' by J T [John Theophilus] Desaguliers The paper describes the use of quicksilver rather than leather to prevent water or air from spilling out of hydraulic engines that utilise pumps. Subject: Engineering / Hydrostatics Read to the Royal Society on 19 April 1722 Published in Philosophical Transactions as 'A description of an engine to raise water by the help of quicksilver, invented by the late Mr. Joshua Haskins, and improv'd by J. T. Desaguliers, LL. D. R. S. S'. 19 April 1722