Reseña del editor
This work is based upon notes and diagrams which were prepared by the writer with no more ambitious object, originally, than to help his railway students toward the obtainment of clear general notions upon the important subject of the slide valve. For practical demonstration of the functions and operation of the slide valve, a large sectional model engine, with provision for variation of the operation of its parts, is very valuable ;but it seems to the writer to be desirable that each student should have in his own possession a model to cogitate upon, and that his model should give him, graphically, results which should be not merely qualitative, but also, in some degree, quantitative, to enable him to institute comparisons between the actions of different valves operated ulftftr vatfy ing conditions.
(Typographical errors above are due to OCR software and don't occur in the book.)
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