Truck
Almost any contrivance on wheels for carrying loads is called a truck. At one time trucks were of such variety as almost to defy description, but the tram-rail and overhead conveniences have revolutionized this, leaving the foundries clear of all except the common hand-truck and wheelbarrow. See IRON-CARRIER; CRANES.
Trunnions are cylindrical projections placed on each side of a flask in a position to balance it. the trunnion forms an axis to turn in a sling, or on a suitably contrived trestle, when the cope is turned over. A depression in the middle of the trunnion prevents the sling from slipping off. See SLING.