Molded plastic

Assembly Required: N
Cord Polarized: N
Disposable Part: N
Height: 1.5 in
Length: 13 in
Tools Required: N
Weight: 3.25 lbs
Width: 1.5 in

A Galileo thermometer, Galilean thermometer (named after Italian physicist Galileo Galilei), or thermoscope is a thermometer made of a sealed cylinder containing a clear liquid and a series of objects whose densities are designed to sink in sequence as the liquid is warmed and decreases in density and vice-versa. It was invented in the early 1600's.

Suspended in the liquid are a number of the weights. Commonly those weights are themselves attached to sealed glass bulbs containing colored liquid for an attractive effect. As the liquid in the cylinder changes temperature its density changes, and those bulbs are free to move, rising or falling to reach a position where their density is either equal to that of the surrounding liquid or where they are brought to a halt by other bulbs. If the bulbs differ in density by a very small amount and are ordered such that the least dense is at the top and most dense at the bottom, they can form a temperature scale. The temperature is typically read from an engraved metal disc on each bulb. Usually a gap would separate the top bulbs from the bottom bulbs and then the temperature would be between the tag readings on either side of the gap. If a bulb is free-floating in the gap, then its tag reading would be closest to the ambient temperature. To achieve this requires manufacturing the weights to a tolerance of less than 1/1000 of a gram (1 milligram)

Manufactured in: China
Material - Country of Origin: China