Personally (but I know nothing about machinery) this will make me very happy. For the electric engine which can be run by waterpower is a clean and companionable servant of mankind but the "heatengine," the marvel of the eighteenth century, is a noisy and dirty creature for ever filling the world with ridiculous smoke-stacks and with dust and soot and asking that it be fed with coal which has to be dug out of mines at great inconvenience and risk to thousands of people.