 One used two vertical slide valve cylinders arranged as a twin cylinder compound engine, and another was a twin cylinder single acting unit with a layout similar to the Stuart Turner No.2 MTB engine, though all in brass/bronze.The business continued to buy and sell scientific equipment through the 1920s, especially electrical equipment such as Wimshurst machines (devices for creating a high voltage).It appears the model steam engines ceased in the early 1930s as adverts in the Model Engineer from about 1933 are for their electrically driven water pump for garden fountains.