The firm exhibited their "Patent Agricultural Locomotive Engine for Threshing, Ploughing and General Traction Purposes" at Battersea in 1862. Aveling moved the cylinder forward from over the firebox to the front of the boiler. The steam jacket that surrounds the cylinders did away with the need for a separate dome (the patent stated that the cylinders were placed within the dome). The jacket reduced condensation, and hence priming, in the cylinders, valve gear and now non-existent supply piping. Ports between the jacket and boiler communicated live steam. The crankshaft was now close to the wheels and the long chain could be first shortened, then disposed of in favour of gears. In 1863 Aveling patented two-speed gearing. Exports at this period were to Prussia and Australia.