speculum metal
The use of the French language.
pig iron suitable for making Bessemer steel
A mixture of around two-thirds copper and one-third tin making a white brittle alloy that can be polished into a highly reflective surface.
plural of salpiglossis
そのアンティーク望遠鏡の鏡面は、銅が約3分の2、錫が約3分の1を占める白く脆い合金で作られており、丹念に磨かれて輝く銀色の光沢を放っていた。
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