In an apparatus for projecting a microfiche, a microfiche holder is demountably mounted on a stage which is movable in a horizontal plane. The microfiche holder is formed with a notch and positioned on the stage, with said notch being engaged by a stopper pin provided on said stage. In changing the microfiche holder, the stage is fixed and a focal plane determining member for retaining the microfiche on the focal plane is moved out of contact with the microfiche.

A clamping device, especially for pistons of internal combustion motors, permitting previous indexing and ensuring the handling and maintenance in position of the said pistons during the half-finish and finish machining operations of the skirt and the lands of said pistons. The device comprises a receiving member in frontal support of the head of a workpiece, presenting, centering and indexing members for the piece towards the said receiving member, and members intended to apply the piece agains…

A pair of pressure plate members for clamping a film in the focal plane of a projector from both sides thereof are pivoted to one ends of a pair of levers for opening and closing operation. The two levers are operated by means of a solenoid in such a manner that one of them reaches the focal plane before the other one does.

A molding method comprising steps of bringing a shielding mold member into contact with the shaping surface of a shaping mold member to provide a mold assembly, filling a charge of a heat resisting particulate material in space disposed opposite the shaping mold member with respect to the shielding mold member, rendering negative the internal pressure of the space containing the charge so as to draw the shielding mold member toward the charge and cause the same to adhere thereto, removing the sh…

A method and apparatus for preventing the dilution of sulphur dioxide containing waste gases in copper concentrate electric smelting furnaces using an electrode of the Soderberg pattern. The waste gases are removed from the furnace chamber and passed to a cleansing station, where solid particles are removed from the gases. The cleansed gas is then divided into two streams, a major stream and a minor stream. The minor stream of gas is passed to an indirect heat exchanger and cooled therein, where…

The ball guide of this solenoid valve, consists of a pressed member acting at the same time as the end cover of the valve case so as to close the magnetic circuit thereof; it consists of magnetic metal formed with a cylindrical projection having formed at the same time in its bore longitudinal grooves for permitting the fluid flow, other means being provided for properly sealing the core passage in the closed valve position.

A semiconductor stress transducing apparatus in which a semiconductor layer having a large piezo-resistance effect is deposited by vacuum evaporation on a highly flexible thin-film substrate of an insulating material and a bending stress is imparted to the deposited semiconductor layer through a flowable viscous material, whereby a change in the internal resistance of the semiconductor layer is detected.

A blow-through evaporative heat exchange apparatus having a blower section with a wet deck section above it. The blower section has at least one slanting wall to provide space for an electric motor and blower under the slanting wall. Diffusion means are provided to ensure a uniform flow of air over the cross section of the wet deck.

Dentures are coated with a film, preferably 0.25 – 5.0.mu., of a dialkylpolysiloxane of viscosity 300 – 100,000 centipoise at 25.degree.C. The coating improves the retention of the denture in the mouth and minimizes food adhesion.

An operating device for a vertical type venetian blind is set forth. A single control means is provided to feed and rotate slats of the blind. By operating the single control means, a travelling gear moves in axial direction, while rotating; and in a part of its axial movement it comes into engagement with a gear for rotating a slat rotating rod and at the ends of said axial movement it comes into means for rotating a slat feeding rod to initiate feeding of the slats.