CHAPTER XIV.

ACCIDENTS TO CYLINDERS AND STEAM CONNECTIONS 162

Importance of the Piston in the Train of Mechanism.--Causes that lead to Broken Cylinder-heads.--Broken Cylinder-heads often Preventable.--When a Main Rod breaks.--Crank-pin broken.--Throttle disconnected.--Oiling the Valves when the Throttle is Disconnected.--What causes a Disconnected Throttle.--Bursting a Dry Pipe.--Other Throttle Accidents.--Pounding of the Working-parts.--Some Causes of Pounding.--Locating a Mysterious Pound.