Clinical thermometer
device · 1867 · Industrial Revolution
Allbutt’s thermometer for measuring body temperature.
What it is made of
- Glass capillary tube — has part. A fine channel for mercury.
- Mercury bulb — has part. A lower ball.
- Capillary constriction — has part. It keeps the mercury from falling — the thermometer “holds” the reading.
Principles and materials it uses
- Glass — is made of. A glass tube.
- Mercury — is made of. Mercury expands when heated.
- Thermal expansion — uses. The mercury column rises when heated.
History: what it evolved from and what it influenced
- Digital thermometer — evolved into. A replacement for the mercury thermometer.
What it is a kind of
- Thermometer — is a kind of. A thermometer.