Abstract: The invention concerns a method of manufacturing a shell mould (1) with several layers (2, 3, 4, 5), including at least one contact layer (2), from a model (6) of wax or other similar material of a part to be manufactured, the method comprising a step of dipping the model (6) into a contact slip forming the contact layer (2) and comprising an inorganic or organic binder and a powder, wherein the powder is a mullite-zirconia composite.

Abstract: The invention concerns a method of manufacturing a shell mould (1) with several layers (2, 3, 4, 5), including at least one contact layer (2), from a model (6) of wax or other similar material of a part to be manufactured, the method comprising a step of dipping the model (6) into a contact slip forming the contact layer (2) and comprising an inorganic or organic binder and a powder, wherein the powder is a mullite-zirconia composite.

Abstract: The invention relates to a toilet apparatus with forcible drainage.Said toilet is of the type comprising a bowl supplied with water and communicating through its bottom part with a lower chamber equipped with means for crushing the faeces and removing them towards a draining conduit. Said toilet being characterized in that the crushing and draining means are designed to be removable, thus permitting the dismantling of the crushing means from the bottom part of the bowl. The invention finds application in toilet apparatus permitting the ready dismantling and cleaning of the crushing and draining members.

Abstract: A power supply designed primarily for polychrome cathode-ray tubes of the penetration type and capable of switchover to three and/or four levels comprises a main high-voltage source and one or more auxiliary sources having lower rated voltage values, the auxiliary source or sources being combined with the main source by means of a set of switches according to the total value of voltage to be applied to the polychrome cathode-ray tube in order to obtain a predetermined color. A circuit for recovering the switching energy is associated with the four-level supply system.