Cylinder Head or Bonnet to Elastic Limit

The plate which closes the end of a cylinder.

A small, cylindrical vessel, open at the top. It is fitted with a piston, to the spindle of which is attached some part that is periodically released to fall quickly. The momentum is taken up by air or liquid confined under the piston.

The corresponding position of crank when the piston is at the end of its stroke.

The flat plate at the mouth of a furnace.

The valve in a pump which prevents the fluid from returning to the pump cylinder after being discharged therefrom by the piston.

A circular plate or wheel attached to the end of a shaft, and carrying crank-pin near its circumference.

A flat, circular valve, one side of which covers a grated or annular opening. The valve moves in the direction of its axis.

Circulating water as it leaves the condenser, having absorbed heat from the exhaust steam.

Terms applied to the various auxiliaries. (See Auxiliaries.)

(See Steam Dome.)

A small pin fast at one end in one of two adjacent pieces and snugly fitting in a hole in the other. It prevents the two pieces sliding one on the other.

The flow of air through a furnace.

Forced Draft. That created by supplying the furnace with air under pressure.

Natural Draft. That due to the difference in weight of the column of hot air in the chimney and an equal volume of cold air outside.

A short link connecting the pins of two cranks attached to the adjacent ends of two shafts in line.

Attachments to pipes or vessels, through which fluids can be led to waste.

Same as above.

A small steel bar used to drive out keys or wedges.

(See Steam Drum.)

A continuation inside of a boiler and above the water, of the main steam pipe.

The amount that a bar of metal one inch in area of cross section will have stretched at the breaking point while being pulled apart in a testing machine. When a bar eight inches long stretches to ten inches in length it has a ductility of 25 per cent.

A circular disc or frame bored out and fitted on a shaft, the centres not being coincident. The circumference is the wearing surface. The distance between the centre of shaft and centre of eccentric is called the throw, or eccentricity.

The rod connecting the eccentric strap with the other part of the valve gear.

The band which encircles the circumference of an eccentric and in which it revolves.

The strain in pounds that a bar of metal of one inch area of cross section will endure at the point of taking a permanent set while being pulled in a testing machine.