The electrode holders are fixed to the cylindrical unit.

This cylindrical block of yellowish limestone, roughly sided, represents a deformed monster.

The block (1) is preferably a cylindrical block having a base (16) and a generally vertical central axis (2) extending generally orthogonally from the base (6).

The equipment also includes a burnisher and a synchronistic temperature adjustment device for the barrel.

Furthermore, the composite mirror has an obliquely upwardly directed plane mirror inclined axially at 45° mounted on the top surface of the truncated cone block or the cylinder block of the above-described integral type cone mirror.

A tool rig (10) for the compaction of particulate materials includes a base and a cylinder block (12) disposed on the base (14).

A Polystyrene "Roofmat" cylinder block ( 32 mm diam and 33 mm length )

At least two pistons (16, 18) are disposed within the cylinder block (12) and one piston is at least partially disposed within one other piston.

It comprises a transmitter and a receiver each provided with a high insulation transformer supplied by an oscillator included in a cylindrical block of insulating synthetic resin.

An elastomeric die spring (12) has a fibre reinforced elastomeric cylindrical block (14) enclosed within a Neoprene sheath (16) with heat conductive retainers (24) and (26) overlying opposite ends of the block to act as heat sinks.

A reactor (1) includes a ring (10) and a cylindrical block (25) on its top to support an annular sealing plate (4).

The block body (2) is formed in a generally cylindrical shape.

The electrode holders are fixed to the cylindrical unit.

Turning the semicylindrical portion (31) of the knock pin (29) to the semicylindrical groove (28) on the side of the movable block (4) results in the movable block (4) being fixed to the base block (1).

The frequency controller of the invention comprises a cylindrical supporting block (40) connected to a casing (36), and a second cylindrical supporting block (32) gliding telescopically inside it by means of friction surfaces.