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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.
Beginner
Unknown
Instructions
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.
Materials for this step:
Carbon Steel Strip1 thin ruler
Brass Strip1 thin rulerTools needed:
Hammer
Anvil2
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.
Materials for this step:
Copper Rivets1 pieceTools needed:
Hand Drill
Rivet SetHammer3
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.
Tools needed:
HammerMaterials
3- 1 thin rulerPlaceholder
- 1 thin rulerPlaceholder
- 1 piecePlaceholder
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