A plunger is forced upwards into the glass in the neck-mould and forms the neck.
The funnel is removed, and the plunger, neck-mould and the mass of molten glass attached to the neck are inverted.
A mass of glass in a viscous state can be rolled with an iron roller like dough; can be rendered hollow by the pressure of the human breath or by compressed air; can be forced by air pressure, or by a mechanically driven plunger, to take the shape and impression of a mould; and can be almost indefinitely extended as solid rod or as hollow tube.
A bottle-making machine combines the process of pressing with a plunger with that of blowing by compressed air.
The neck of the bottle is first formed by the plunger, and the body is subsequently blown by compressed air admitted through the plunger.
It is attached to a brass disk E, which is fastened to the centre of the diaphragm F by means of a rivet, and is capable of moving to and fro like a plunger when the diaphragm vibrates.
Attached to the rod by offsets are one or more plunger or bucket pumps, set at intervals in the shaft.
Compressed air admitted through the plunger forces the molten glass to take the form of the bottle mould and completes the bottle.
The operator knows by touch when the plunger has pressed the glass far enough to exactly fill the mould.
An arrangement of this kind for shifting the load from a large cage at one operation was introduced by Fowler at Hucknall, in Leicestershire, where the trains are received into a framework with a number of platforms corresponding to those of the cage, carried on the head of a plunger movable by hydraulic pressure in a vertical cylinder.
In order to deaden the vibrations of the index arm when weighing goods a vertical rod is attached to the lever from the lever machine near its left-hand end, and this rod carries on its lower end a plunger which works in a closed cylindrical dash-pot containing oil or glycerin.
By means of suitable and simple mechanism this vertical movement of the cylinders works plunger pistons in a pair of cylinders which contain glycerin, and these deaden the vibrations of the machinery while weighing is going on.
There were errands to run: a walk to the variety store for light bulbs—a matron in 2C had filched every one before departing—a toilet plunger job in 3B.
Variant of Pumpe is Plumpe, which is generally taken as being an echoic word, imitating the sound of the plunger, but the primary notion seems to be that of a pipe or tube.
The simplest forms of pumps employed for forcing liquids are "plunger pumps," consisting essentially of a piston moving in a cylinder, provided with inlet and outlet pipes, together with certain valves.
The plunger` is generally worked by a hand lever.
The action of the enclosed water in transmitting motion takes place during the inward stroke of the pump-plunger, when the above-mentioned valve is open; and at that time the press.