“…However, from about 1860, smaller engines of the Stirling/hot air type were produced in substantial numbers finding applications wherever a reliable source of low to medium A typical late nineteenth/early twentieth century water pumping engine by the Rider-Ericsson Engine Company power was required, such as raising water or providing air for church organs. [21] These generally operated at lower temperatures so as not to tax available materials, so were relatively inefficient. Their selling point was that, unlike a steam engine, they could be operated safely by anybody capable of managing a fire.…”