The Spy Hole

I am the George Burns of Trance.
engineeringhistory:

Rose for Lord Kelvin’s compass, patented in the 1880s. The Kelvin Compass was used for maritime navigation and employed a system of two correcting magnets.

engineeringhistory:

Rose for Lord Kelvin’s compass, patented in the 1880s. The Kelvin Compass was used for maritime navigation and employed a system of two correcting magnets.