How does a wood or coal powered water pump work?

Question

These pumps were used in homes in the Eastern U.S. about 100 years ago. How do they work and are they still made and where? I think they were called (blank)- Soningson pumps. Steam was not involved, but had something to do with a heated air chamber, I think?

Answer 1

It might have been a Rider Ericsson engine, a hot-air engine which was used for water pumping in rural areas. See the ref.