MECHANICAL PRINCIPLES OF THE STEAM ENGINE.
CLASSIFICATION OF ENGINES.
1. Q.--What is meant by a vacuum?
A.--A vacuum means an empty space; a space in which there is neither water nor air, nor anything else that we know of.
2. Q.--Wherein does a high pressure differ from a low pressure engine?
A.--In a high pressure engine the steam, after having pushed the piston to the end of the stroke, escapes into the atmosphere, and the impelling force... more...