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Bimetallic Strip: Ure's Thermostatic Bar of Steel and Brass (1839)
The compound bar of Andrew Ure's 1831 thermostat: a thin steel ruler and a ruler of hard-hammered brass riveted face to face. Brass expands more than steel, so when the bar warms it bends, and the free end can work a valve, damper or cock.
Bolt one end fast and leave the other free to move.
Source: A. Ure, Dictionary of Arts, Manufactures and Mines (1839), 'Thermostat'. Picture: the book's Fig. 1130.
Baguhan
Unknown
Mga Tagubilin
1
1
Prepare the two rulers
Prepare the two rulers
Take two long thin rulers, one of steel and one of brass. Hammer the brass hard.
Mga materyales para sa hakbang na ito:
Tirang carbon steel1 thin ruler
Guhit na tanso1 thin rulerMga kailangang kasangkapan:
Martilyo
Palihan2
2
Rivet them face to face
Rivet them face to face
Lay the rulers face to face and rivet them firmly together along their length.
Mga materyales para sa hakbang na ito:
Remaste na tanso1 pirasoMga kailangang kasangkapan:
Barenang de-kamay
Set ng remachesMartilyo3
3
Mount and use
Mount and use
Fix one end of the compound bar by bolts and leave the other free: when heated the free end moves by flexure, and through links and levers it can open or close a valve, cock, register or ventilator. In the still's heat-governor two such bars stand with their edges up and down.
Mga kailangang kasangkapan:
MartilyoMga Materyales
3- 1 thin rulerPlaceholder
- 1 thin rulerPlaceholder
- 1 pirasoPlaceholder
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