Abstract: A method is described according to which composite particles made up of carrier magnetite particles with calcium carbonate and calcium phosphate flakes adhered thereto and present in a fluid suspension are separated into particles and flakes. To accomplish the method, the suspension is first introduced into the intake of a centrifugal pump. Vanes within the pump are then rotated to produce turbulence in the pump housing and a velocity gradient within the tangential discharge. The composite particles within the liquid are subjected to the velocity gradient and to shearing forces which cause an effective separation of the composite particles. The velocity gradient is such that shearing separation of the composite particles results in separated elements sized with the magnetite particles at least as large as the separated flakes of calcium carbonate and calcium phosphate.

Abstract: Multiphase switchgear for high voltages consisting in a number of components such as switches, transformers for measurement and protection, busbars and cable connecting means, said components being interconnected by coupling elements and said components and coupling elements being provided with connecting contacts, the spatial dispositions are standardized.

Abstract: A switch for high voltages comprising co-operating fixed and movable spherical contacts, of which the or each fixed contact consists of a stationary body in the shape of a hollow spherical cap and a potential field controlling screen adapted to be forced by the respective movable contact into said hollow cap, said screen being spherically complementary to said spherical cap, when the switch is in its open condition, and being also provided with the contact surfaces to conduct the main current.

Abstract: Metal clad switchgear, comprising in one of the compartments of, or in a separate casing associated with its envelope system a movable voltage measuring transformer which is adapted to be adjusted in various positions, in one of which at least one of the high tension terminals of said transformer is connected to a conductor of the switchgear, in another one of which said terminal may be connected to earth and in still another one of which said terminal may be dead.

Abstract: In electric switchgear for high voltages a busbar system, of which each busbar consists of two identical rod-shaped conductors which are fastened by bolts to supporting insulators in specularly symmetric fashion.

Abstract: Monophase or polyphase circuit-breaker for high voltages, in which the switch work is or the switch works of all phases together are insulatedly accommodated in a closed metal casing and the two end contact holders of the or each switch work are connected through connecting members having the shape of coaxial hollow spherical caps which face each other with their edges to the connecting conductors of the circuit-breaker which extend insulatedly through the wall of the casing, said spherical cap-shaped connecting members forming at the same time potential gradient controlling shields.

Abstract: Metal clad switchgear for high voltages comprising monophase switchgear units, in each of which the circuit-breaker is accommodated in a spherical casing and each isolator connected to the circuit-breaker is provided in a substantially tubular casing which is attached to the casing of the circuit-breaker and has its longitudinal axis directed radially or substantially radially to the sphere of the circuit-breaker casing.