Hydrometer
"The Fahrenheit hydrometer of constant volume is made of glass, the bulb at the bottom being loaded…
Thermometer
"A bulb of liquid is placed in the base of the glass graduated tube. As temperature increases, the volume…
Differential Thermometer
"Used to compare the temperature between two environments. As the temperature in one bulb increases,…
Fahrenheit and Celcius scale Thermometers
"Thermometers showing the corresponding points for water's freezing and boiling." -Avery 1895
