Bob Jorgensen's version of a Frisbie horizontal overtype engine made by J. and E. Stevens and Company, Connecticut about 1871. It had a cast iron boiler and patent gear operated from the connecting rod without the use of an eccentric. This was built from a single photograph published in "Toy Steam Engines" by Bob Gordon, an inexpensive British booklet that we have sold from time to time. (no description on this web site)
This original from which this beautiful engine was derived was a model engine originally manufactured by Witney in London in the early 1900's. This dual cylinder engine sported 1" bore cylinders with 1 1/2" stroke. Far more complete plans are described in "Model Making" by R F Yates from 1925 than what Bob Jorgensen usually works with.
Bob writes:
"This is Robertson's semi-rotary engine as pictured on page 299 of Modern Steam Engines. [described in our catalog] The square piston is 3/4 x 3/4. Don't know how many were built but I bet they were a pain to keep packing in them. Modern Steam Engines by Joshua Rose is truly a book that no steam nut should be without."
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