Abstract: A pneumatic vibrator having reduced noise levels is provided with an exhaust chamber in a baseplate thereof. The exhaust chamber is limited by walls of the baseplate, a bushing, and the outer surface of a hollow elastic element. The elastic element is a truncated cone, the smaller base of which firmly encompasses a bushing around a tie element, while the larger base bears against the baseplate. The exhaust chamber is in communication with an above-membrane chamber via a central through duct. The above-membrane chamber connects with the atmosphere by radial ducts in the cover of the baseplate, in which an annular collector is made, communicating with the radial ducts. The flow area of each of the ducts is less than the flow area of the collector. Coaxial axial ducts made in the cover and in the baseplate communicate with a second annular collector made in the baseplate and exhaust air to the atmosphere.

Abstract: The method includes the following step of forming at least one material input zone on the surface of an electrolyte, disposing a working tool in the input zone to push the material into the melt of the electrolyte, imparting mechanical oscillations and translatory motions to the working tool in the direction towards the electrolyte and back therefrom with the length of said motions being within the range of values from about 10.0 to about 120.0 sec. The method further includes transporting material into the input zone and forming some layer in the material input zone, and after accumulation of a sufficient amount of the material, the latter enters into contact with the working tool. The aforesaid steps increase the capacity of the material input zone and reduce power expenditures on the input of material into the electrolyte.