'Galileo's Thermometer' or 'Termometro Infingardo',...
'Galileo's Thermometer' or 'Termometro Infingardo', 1989-1999
Thermometer consisting of a number of glass balls weighted to be of different densities, in a liquid, arranged to sink one after the other as the temperature rises, known as a 'termometro infingardo' or (incorrectly) as 'Galileo's thermometer', made by Ad-Glass, Stillwater, Oklahoma 14075, 1989-99.