The forearms, which are extended, have been cast separately and soldered or brazed on to the elbows.
The Romans used it largely, as it is still used, for the making of water pipes, and soldered these with an alloy of lead and tin.
Mile of Warsaw in 1828, who termed it a "hydrostatic air-pump without cylinders, taps, lids or stoppers," this is attained by using, both for the inlet and the outlet, vertical capillary glass tubes, soldered, the former to somewhere near the bottom, the latter to the top of the vessel.
The blades of the rotator are adjustable, being fitted into its tube or body by slits and holes and then soldered.
The plate when passed as flawless was cut into the desired form and moulded as far as possible into shape, the edges where necessary being soldered.
