Abstract: The present invention relates to a digester (10) for a digester plant (1), comprising a digester tank (11) defining a digester tank chamber (62) and having a module opening (69) and a digester module (72) located in the module opening and extending into the digester tank chamber (62). The digester module is removably attached to the digester tank and comprises a heater (84) for heating material in the digester tank (11) together with at least one pipe (94; 96; 118) with an inlet (98; 108) and an outlet (102 104; 110; 122), one of which is inside the digester tank chamber 62 and the other of which is outside the digester tank chamber (62).

Abstract: A film camera has a body enclosing a light-tight film space. A film unit disposed in the film space, includes a filmstrip having a longitudinally extending row of uniform perforations. The perforations each have at least one concavely-curved edge extending in a direction transverse to the filmstrip. The film space is substantially free of skives despite prewinding of the filmstrip in the camera, even if the prewinding is at a high-torque level.