Words and pictures from “Electric Lighting for Marine Engineers” by Sydney F. Walker, undated but approx. 1890 (a bookseller lists an 1892 edition). Lots of steampunk potential here!
Title: Electric Lighting for Ships
Published by: Whittaker & Co.
Total items: 13
Out of copyright (called public domain in the USA), hence royalty-free for all purposes usage credit requested, or as marked.
Fig. 69.—Showing Internal View of Tumbler Switch.
“Figs. 69 and 70 are inside and outside of the