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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.
初学者
Unknown
说明
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.
此步骤所需材料：
碳素钢带1 thin ruler
黄铜条1 thin ruler所需工具：
锤子
铁砧2
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.
此步骤所需材料：
铜铆钉1 个所需工具：
手摇钻
铆钉工具组锤子3
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.
所需工具：
锤子此蓝图制作
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