Speaking trumpet made between 1700-53, maker and place of production unknown, but once belonged to Stephen Demainbray.

Speaking trumpet which once belonged to Stephen Demainbray and was used in his lectures on natural philosophy. Demainbray worked as superintendent at the King's observatory at Kew from 1768 and his collection of instruments and apparatus was absorbed into the King's own collection. Speaking trumpets were common in courses of experimental philosopy in the mid-eighteenth century and were advocated for use on ships or for overseeing a large workforce.