MACHINES:--The threshing-machine--Mowing-machines. SOME NATURAL PHENOMENA:--Why sun-heat varies in intensity--The tides--Why high tide varies daily 410 HOW IT WORKS. Chapter I. THE CONSTITUTION OF THE SLIDE-VALVE AND ECCENTRIC. The subject may be stored, may contain “Defects,” such as, but not limited to, incomplete, inaccurate or corrupt.