The engineer's sketch-book of mechanical movements, devices, appliances, contrivances and details employed in the design and construction of machinery for every purpose

by Thomas Walter Barber

[1090]. Small pistons have generally two rings of steel or brass sprung into the grooves.

[1091]. Double-acting hydraulic piston for cold water; if single acting, one leather only is required; for hot water, rings are generally employed.

[1092]. Indiarubber rolling ring packing, used on Kennedy’s patent piston water meters.

[1093]. Piston, with junk ring for fibrous packing.

Numerous patents are in use for springs of various kinds applied to piston rings. See [Section 80].

STUFFING BOXES, &c.

[1094], [1095], [1096], & [1097]. Sections and plans of gland stuffing boxes.

[1098]. Leather packing ring or collar, used generally for higher pressures up to 3 or 4 tons per square inch.

[1099]. Stuffing box for hydraulic rams, up to pressures of about 1000 lbs. per square inch, with special hard packing.

[1100] & [1101]. When the wear on an hydraulic leather is considerable a guard-ring should be added, as shown here.