Abstract: A filter wall constructed separtely from the frame member is clamped in a clamping slot, to which toward the outside edge of the filter plate a widened sealing slot in a shoulder of the support is connected. A projecting edge of the filter wall extends into the latter slot with the shoulder overlapping, the filter wall having an annular flange directed to the outside. The seal is arranged in the sealing slot and has a U-shaped cross section with two arms extending inwardly, whose arms enclose and seal both sides of the annular flange and which seals the support on one side and the frame member on the other side. The spacing between the seal and the joint is sufficient that upon release of the closing pressure of the filter press, without disengaging it, the frame can be moved sufficiently far from the support that the pressurizable chamber is unsealed at the seal in the sealing slot.

Abstract: A microfilm reader having a film stage which is displaceable in two coordinate directions for moving a microfiche supported thereon through an optical path defined by a projection lamp and an optical system which projects an image of the microimages arranged in rows and columns on the microfiche onto a ground glass screen via a plurality of reflecting mirrors. The microfilm reader comprises in combination on the ground glass screen or on the housing adjacent to the ground glass screen a first scale corresponding to the microimage rows and a second scale corresponding to the microimage columns, a movable first marking in combination with the first scale and a second marking in combination with the second scale, these markings being coupled with the displacement means of the film stage to indicate the row and the column of the microimage presently projected onto the ground glass screen.

Abstract: The upper flight of an endless filter belt is supported by a backing sheet as it passes through a feeding and initial partial dewatering zone. The upper flight of the filter belt then passes through a main dewatering zone while being subjected to pressure in a direction to force liquid therethrough. Drainage slots in the upper surface of the backing sheet extend at an angle to the direction of travel of the upper flight and leave narrow strips between adjacent slots which engage the under surface of the upper flight.