Johannes Stumpf pdf The Una-Flow Steam-Engine (Classic Reprint)

Preface. All new doctrines are viewed with suspicion until some inquiring mind finds out that there is really nothing fundamentally novel in them. The principles on which the doctrines are based are proved to be old, but the fact remains that the Application of the principles is new. In the case of the uni-directional flow engine, or as it has been called for brevity, the una-flow engine, the above remarks apply very fully. After successful trials with my various designs of una-flow engine, friends and critics have been very ready and kind in pointing out that something very like it has been done before .T he great point is that nothing exactly like it has been done and none of the previous attempts have been attended with anything like the practical success which has attended my introduction of the una-flow engine about three years ago. Of the earlier attempts, preference ought possibly to be given toM r. J. L. Todd, who not only took out several patents in Britain for his improvements, but made actual tests with his engine. It is interesting to note the lines of development which Mr. Todd followed. He started off in his early British patent No. 7301 of 1885, with a very clear statement of the thermal conditions prevailing in an engine cylinder when the inlet was at the ends and the exhaust ports arranged in the centre of the cylinder and controlled by the piston. The features he emphasised were the hot inlet and the cold exhaust. From the very commencement of his investigation, Todd showed the tendency to move along wrong lines. He suggests that the excessive compression will be minimized by heat given up to the cylinder walls during compression which walls, he infers in order to perform this function, should not be jacketted. In fact J. L. Todd went so far as to heat the cold end instead of the hot end by placing the steam chest over the exhaust belt. The(Typographical errors above are due to OCR software and don't occur in the book.)