Paper, 'An account of an experiment touching the propagation of sound passing from the sonorous body into the common air in one direction only' by Francis Hauksbee Hauksbee writes: 'Since by the former Experiment actual Sound could not be transmitted thro a Space void of Air; I was inclin'd to try whether that Sound, which should be propagated in a Receiver, having a Communication with the open Air at one small Apperture only, but otherwise intirely surrounded by a Vacuum; Whether I say, that Sound would be increas'd, or continu’d Sounding longer, at each Stroke that should be given the Bell, than it would do, were not its Body encompass’d by such a Medium.' He describes an experiment on the propagation of sound. Subject: Physics Published in Philosophical Transactions as 'An account of an experiment, touching the propagation of sound, passing from the sonorous body into the common air, in one direction only' [1709]