Abstract: Apparatus for processing signals which are transmitted by the transducers of photoelectric cells scanning discrete marginal fields of square or rectangular film frames on a web of photographic film has relay-actuated switches which can connect the transducers of selected cells to each other and with the foreground and background inputs of a signal receiving circuit which is connected to the exposure controls of a copying machine or to a data carrier. The frames are examined by an attendant who energizes selected relays or several relays at a time to thereby cause the switches to transmit to the two inputs appropriate signals denoting the density and/or other characteristics of corresponding groups of neighboring marginal fields, depending upon whether the frame which is being inspected by attendant has been exposed in normal orientation, at right angles to normal orientation or upside down.

Abstract: An optical apparatus in which a beam of light is caused to travel along a predetermined direction is provided with a light interrupter for interrupting the beam. The light interrupter includes a light-interrupting component, such as a shutter blade or color filter, and a driving coil connected to the light-interrupting component. The light-interrupting component and driving coil are mounted for pivotal movement about an axis substantially parallel to the beam direction, with the light-interrupting component moving between a light blocking position and an unblocking position. A control circuit is connected to the driving coil for effecting energization of the coil. A magnet arrangement is so positioned as to establish a magnetic field through which the driving coil moves when the driving coil pivots around the pivot axis, with the magnetic field being oriented substantially perpendicular to the direction of movement of the driving coil.

Abstract: Apparatus for influencing the color of a beam of printing light in a photographic printer has three sets of coplanar filters which are movable into and from the path of printing light. The filters are mounted on holders in the form of slides, levers or pulleys and are pivotable or reciprocable between inner end positions in which they form a substantially uninterrupted composite filter extending across the entire beam of printing light and partially or completely retracted positions. The filters of each set are movable by separate actuating means which can move all filters of the respective set simultaneously toward or from the inner end positions. such actuating means may employ endless flexible elements, flexible elements of finite length, or rings which have cam slots for followers provided on the holders for the filters of the respective set.