Alloys of copper and manganese
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Article
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1880
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Elsevier Science
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English
β 50 KB
## 177 of them, and if we shape them into a valve, as shown by the shading, it will have the property required. It follows, that if the cone of the top plate have its imaginary apex on a level with the bottom seat, that seat must be flat, as in Fig. 3.