>>196, ID:tgzy4pu/
　　>煙管は銅じゃなくて真鍮だと思うから原典当たり直してみ
>>198, ID:tgzy4pu/
　　>銅の実例を紹介して下さい

個々の実例は資料不足で書けませんけど、一般論としてなら、　原典(←笑い)当たり直してます。

①A History of the American Locomotive Its Development:1830-1880
John H. White(米国人)著　　　p99
The earlist American locomotive boilers invariably contained 100-150 copper tubes.
(中略)Brass tubes were firct used in this country in 1851.

②Some Historical Points in the Details of British Locomotive Design
Ahrons(英国人)著(1910年)
For meny years the L. & N.W.R. and G.W.R. have used steel tubes,
the Midland and some railways have used a red metal or copper composition,
and other lines use brass. (中略)
A copper or brass tube, when worn at the firebox(後略)