User:Chuckhoffmann/sandbox/Broadwell Ring

https://en.wikipedia.org/wiki/Broadwell_Ring

https://www.google.com/books/edition/Engineering/ZJ5DAQAAIAAJ?hl=en&gbpv=1&dq=Broadwell+gas+ring&pg=PA73&printsec=frontcover

Van Nostrand's Eclectic Engineering Magazine - https://books.google.com/books?id=SbNMAAAAYAAJ&pg=PA139&lpg=PA139&dq=L.+w.+broadwell&source=bl&ots=hq239w-uv8&sig=ACfU3U01mtVjkSAMlzydpjk3iQ4gD1WKhw&hl=en&sa=X&ved=2ahUKEwizwqX0h4DrAhUQlnIEHZx9AK0Q6AEwDnoECAoQAQ#v=onepage&q=L.%20w.%20broadwell&f=false

Lewis Wells Broadwell, American engineer.

First patents for system given 1860, while Broadwell was in New Orleans.

Moved to Carlsruhe before 1874.