Abstract: Apparatus and a process for electroylic recovery of silver from fixing baths obtained by development of photographic films wherein the fixing bath solution coming from the tank for the fixing bath to the development apparatus is fed from the development apparatus into one chamber in a recovery apparatus comprising two chambers until the said first chamber is filled whereupon the silver precipitation is started in the said chamber; an automatic redirection of the liquid flow from the development apparatus to the second chamber of the recovery apparatus is made to the said second chamber which being filled with liquid during the precipitation process in the first chamber. After concluded silver precipitation in the first chamber the liquid treated therein is automatically fed to the sewage. When the second chamber has been filled the precipitation process in the same is started. Simultaneously the liquid flow from the development apparatus is automatically fed to the first chamber which now is empty.

Abstract: A process for manufacturing a unique fire retardant particleboard includes the supersaturation of wood chips, followed by spraying of the wood chips with an aqueous solution of borate and sulfuric acid, after which the sprayed wood chips are allowed to stand for a period of time to become impregnated and saturated with the aqueous solution. The impregnated wood chips are then allowed to dry, after which a urea formaldehyde adhesive is applied to the wood chips, and the chips are consolidated to form the fire resistant wood particleboard.

Abstract: A baseboard for electrical installation includes a shaped cover part which is fastened to a wall by holding means, and is provided with longitudinally extending bare wires which may be readily connected to adapters to form electrical switch apparatus or electrical distributing elements in the baseboard.

Abstract: A capo tasto made of a metallic plate, a medium count nylon string, a synthetic rubber plate and other accompanying improvements, compresses the guitar neck and tightens the guitar strings by combined pressure of a synthetic rubber plate and a medium count nylon string, the construction of the said apparatus being simplified and the operation thereof being convenient and handy.

Abstract: A noise is generated unavoidably owing to hunting phenomenon that appears in process of increasing or decreasing torque to be transmitted by a hydraulic coupling in a hitherto known type, when it is subjected to change of the ambient temperature.A purpose of this invention is to provide a new and unique hydraulic coupling which enables hydraulic connection to be effected very quickly in such a way that engagement or disengagement between ferrite and magnet is applied to transfer mechanism in hydraulic coupling, depending on the ambient temperature.The above purpose of the invetion has been accomplished as follows.Magnetical attractive force between ferrite and magnet is predetermined to overcome spring force in a normal temperature, and working temperature for this new mechanism according to the invention is selected around at Curie temperature of said ferrite material.