Rare period rotary stationary engine

A rare Victorian rotary stationary engine, of unusual design. Spoked flywheel 28cm in diameter, vertical polished brass exhaust, inlet, vertical pressure valve, gearing to pulley wheel drive. The engine having A framed side supports with split bearings. Base 31cm x 29cm. Height to top of exhaust 41cm.
*We are not sure how this engine operates and will be happy to hear from anyone who can give us further information.
*Provenance: Ronald H Clarke Collection. Weeting Rally Norfolk Special Ronald Clarke auction.