We have described the simple devices, one square metre of the surface of which gives 1 hp. To obtain this energy ... The firewood and coal will not lie at the bottom of the hearth but will hover inside the furnace, filling it from bottom to top. This ... But to start with we do not need ordinary fuels in space, and should the need ever arise for them, we could make use of coal dust, liquid fuel and artificial draught.
|Title||:||The Aims Of Astronautics|
|Publisher||:||The Minerva Group, Inc. - 2004-07-02|