Cryptograph (coding and decoding machine) by Sir Charles Wheatstone, 1843-1875 Telecommunications 1843-1875
Speech memory board from System X Automatic Announcement Subsystem, 1979-1985 Telecommunications 1979-1985
Joule's original calorimeter ('paddle-wheel apparatus') used in determining the mechanical equivalent of heat. Copper mixing vessel with vane and spindle mechanical equivalent of heat apparatus Heat 1876
Archibald V Hill’s thermopile used to measure heat production, England, 1950-1960 Laboratory Medicine 1950-1960