Description of an Improved Aire-Pump: and an Account of Some Experiments Made With It, by Which Its Superiority Above All Other Air-Pumps Is Demostrated

Description Of An Improved Aire-Pump: And An Account Of Some Experiments Made With It, By Which Its Superiority Above All Other Air-Pumps Is Demostrated — John Cuthbertson. This early work by the Mathematical Instrument-maker presents an improved air-pump that surpasses earlier designs built with cock-operated valves or leather valves. After surveying prior attempts by Smeaton and Cavallo, Cuthbertson describes a new configuration in which the piston interaction opens and closes the communication with the receiver using wires, removing dependence on external valves, and includes an internal oil reservoir to manage lubrication. The text includes detailed Plate drawings and explanations of how to operate the pump for exhausting and condensing air, with notes on maintaining dryness and preventing leaks. The author reports experiments employing barometer-based gauges (long and pear forms) to measure rarefaction, describing results up to hundreds or thousands of times rarified under favorable conditions, and cautions how moisture, heat, and the presence of elastic fluids from damp leather can skew readings. The discussion culminates in a case for the pump’s superiority, its practical variations, and guidance on use, maintenance, and pricing.