The Metallurgy of Silver, Gold, and Mercury in the United States (1887)
EGLESTON, Thomas. · Offices of “Engineering” · leaf 114
British Library · HMNTS 7104.e.13. · Digitised by the British Library with Microsoft · No known copyright restrictions (public domain). Free to use for anything.
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer03inte-137-78.webp)
