Abstract: Apparatus for making an infusion, e.g. tea or coffee, and having a piston and cylinder for blowing air through the infusion and then drawing it through a filter base, the cylinder having a flange which is slidably received between arms of a support, the flange having in its opposed side faces grooves which receive inward facing flanges on the arms and there being a disconnectable connection between the piston connecting rod and its operating crank so that, when said connection is disconnected, the cylinder can be mounted on and removed from the apparatus.

Abstract: A copying system and apparatus wherein a first electrostatic image of an original is formed and developed on a first photoconductive surface, and second electrostatic images of the developed image are repeatedly formed on a second photoconductive surface by illumination of the first surface. The second images, which can be formed at high speed, are developed and transferred to copy material.

Abstract: A magnetic brush monocomponent developer unit includes a doctor blade for rendering uniform the layer of toner magnetically attracted to the surface of a shell within which a rotating magnetic roller is positioned. A coil connected to the doctor blade receives an alternating magnetic field in response to rotation of the roller and the induced voltage fluctuations in that coil are sensed to determine when the voltage amplitude exceeds a given threshold value (indicative of a low amount of toner held back by the doctor blade) at which application of toner to the layer by way of a metering roller and sealing brushes is resumed.