Aside from Boyle's three pumps, there were probably no more than four others in existence during the 1660s: Christian Huygens had one in The Hague, Henry Power may have had one at Halifax, and there may have been pumps at Christ's College, Cambridge, and the Montmor Academy in Paris.
Außer diesen drei Pumpen Boyles gab es in den 1660ern vermutlich nur vier weitere: Christiaan Huygens hatte eine in Den Haag, Henry Powers in Halifax könnte eine gehabt haben, und es könnte am Christ’s College und der Montmor Academy in Paris Pumpen gegeben haben.