Abstract: Means of teacher teaching and pupil learning to spell words and sentences, with code marked alphabet letters and code marked word and sentence lanes.

Abstract: An interposer in a typing machine key action is supported by an arcuate spring and a shelf. When a key lever bears against the arcuate spring to release the interposer from the shelf, the arcuate spring snaps the interposer against a pawl that engages a power roll to initiate a typing operation. Potential energy is restored to the arcuate spring as the key lever lifts the interposer back to rest position. The arcuate spring serves as a support and frictionless pivot for the interposer and biases the interposer against the shelf while providing energy to impel the interposer against the pawl.

Abstract: A teaching machine adapted to take account of the student's ability and progress operates with programmed cards and includes three stacking means, controlled conveyor means, display means and a student input means, such as a keyboard.

Abstract: A gap is provided between two teeth on a power roll in a typing machine repeat key action, and a cam follower surface is provided on a repeat interposer. A repeat typing operation can be initiated only when the cam follower surface engages the gap. When the key action is not in a repeat position, a latch and a forked lever cooperate to hold the repeat interposer away from the power roll; when the key action is in the repeat position, the forked lever holds a single-action interposer out of the way. The gap prevents skipped and uneven repeat typing operations during high-speed operation by giving the actuator and the typebar enough time to settle into rest position.

Abstract: An audio visual device for teaching students a variety of subjects and motor skills, said device including a work surface, a projector, an audio device and a control package; said projector may be a movie, slide or film strip and projects onto the work surface a visual image with which the student may interact; said audio device, such as a tape recorder, provides audible instruction in synchronization with the visual image provided by the projector; said control package regulates the sequencing of the projector and the audio device in response to the student's activating a look-up button for additional information and pushing an advance button if no additional information is required and color filtering and spatial filter masking the visual image control the display of additional information to the student.

Abstract: An ordnance piece is aimed at a terrain and the trajectory followed by an imaginary projectile from the ordnance piece is calculated. A range finder is sighted through a succession of points along the trajectory onto the terrain. Simultaneously the distance between a fixed reference point and each of the points through which the range finder is sighted is also calculated and these two distances are compared until the range finder gives a reading which corresponds to a point on the trajectory. This point corresponds to the intersection of the trajectory with the terrain and is marked so as to indicate where the imaginary projectile would have hit.

Abstract: A perceptual cells guide is provided for persons requiring manual assistance in forming messages upon paper sheets or the like. A substantially rigid guide sheet is secured in position adjacent the face of the paper, and this guide sheet is composed of a plurality of parallel, intersecting horizontal and vertical strips of substantially rigid material, forming a plurality of regularly arranged perceptual cells which extend across and up and down the sheet of paper.The cells are preferably rectangular and are aligned with one another vertically and horizontally. Each cell has a pair of spaced apart horizontal guide edges and a pair of spaced apart vertical guide edges, all forming guides for persons of limited sight or who otherwise require assistance in forming orderly messages on the paper.

Abstract: A language instructing device comprising a board containing squares with frequently used syllables forming words in the language and playing pieces bearing corresponding verbal indicia. The board is provided with marginally open ended slots for containing the pieces and especially designed covers to assure their relative security when the device is not in use.

Abstract: A selector system for a type-bearing element of a typewriter, accounting machine or other office machines, wherein a positioning member for the type-bearing element is positioned positively by a series of cam followers movable by a corresponding series of cyclically actuated cams and controlled by selectively settable stop elements. The type-bearing element comprise a shell on which the types are distributed in rows and columns. The shell is rotatable on a support sleeve provided with two side walls external to the shell. The types are distributed in two groups selectable by a transport mechanism connected to the type-bearing element through differential gears controlled by a bistable spring and two stop elements.

Abstract: Educational and display apparatus which comprises indicia representative of multiple entities and means associated with said indicia which depicts the events which each of the entities experiences, the sequence in which said events are experienced, and the interactions between said entities.

Abstract: A mounting and control arrangement is provided for a threaded rod such that a subject spinning a split nut on the threaded rod can be "timed" for successive trial rotations. One series of times are taken with the threaded rod stationary. One or more trial times are taken with the threaded rod being rotated at a speed that requires more concentration and effort on the part of the subject. The various time trials are assimilated to provide a "persistence" rating for the subject.

Abstract: A high speed printer receiving line-by-line character data from a computer employs a number of sets of hammers and a belt carrying a number of sets of characters. The belt travels continuously past the hammers and the spacing between characters is greater than the spacing between hammers so that, during one cycle in which all characters of a set have passed successively into alignment with a given hammer, there are a number of scan cycles in which a number of different hammers (one from each set) are aligned with characters a given number of successive subscan times, where the aforementioned number of scan cycles is equal to the number of characters in a set. Thus, the designation of a particular scan cycle for any given hammer uniquely defines the character which will be struck by that hammer during that subscan uniquely related to that hammer.

Abstract: An electrothermal printing unit for writing dots matrix characters on a thermosensitive paper comprises a print head carrying a plurality of thermo-activable printing elements aligned along a printing line of the recording medium.The head is reciprocated in a direction parallel to the printing line of the recording medium. The recording medium is moved incrementally perpendicular to the direction of a line of printing in synchronization with the movement of the head and control means are provided for selectively activating the printing elements at a succession of positions of the head in each of a succession of strokes thereof in an arrangement such that each element print all the points of at least one character of the line of characters during the succession of strokes.

Abstract: A writing guide having a paper support surface, a paper retaining clip, a stiff writing guide strip with an elongated slot and a mechanism for stepwise moving the strip from the top to the bottom of the paper. The mechanism includes a square stop bar with sets of spaced stops protruding from each face thereof. The strip carries an abutment finger. The stop bar is mounted for unidirectional rotation about an axis parallel to the direction of motion of the strip so that a set of stops lies in the path of travel of the finger. A knob at one end of the bar is manually rotated, removing one set of stops from the path of travel and moving the next set into the path, the stop sets being longitudinally offset so that the finger can move longitudinally from one stop to the next. A spring continually urges the strip and finger toward the bottom of the page. A guide supports the strip and maintains it in proper position relative to the stop bar and the support surface.

Abstract: A psychological teaching apparatus is described having a cover plate and successively therebeneath a question analysis sheet, a spacer plate, an answer key plate, and a series of electrical contacts, a series of aligned holes in said cover plate and spacer plate representative of the questions to be answered and corresponding holes in the answer key plate representative of the answers to such questions, the series of electrical contacts beneath the holes of the answer key plate being connectable with an electrical probe passing through the answer key plate, and a series of lights electrically connected to said probe and said electrical contacts to become actuated upon contact of the probe with each said contact for successive questions.

Abstract: This invention relates to a mathematical teaching aid comprising a beam which has two parallel longitudinal upper faces each face being divided up by equally spaced marks representing numbers, the numbers on one face progressing from 0 at one end to n at the other end of the beam face, the numbers on the other face progressing from 0 at the mid-point of the face to n/2 at one end and -(n/2) at the other end of the beam face.

Abstract: A pencil holder device is used to hold a pencil in a correct position within a hand of a user for teaching proper penmanship. The pencil holder device consists of a three dimensional body molded as one integral plastic piece, wherein the sidewalls and a portion of the bottom base of the body engage the palm of the user's hand. The forward portion of the body of the pencil holder device is held between the first finger and the thumb of the user. A thin tail section of the body rest on top of the web portion of the hand between the user's thumb and first finger. The pencil is contained within a bore contained within the body, wherein the writing end of the pencil extends outward from a forward end of the body.

Abstract: Apparatus for deriving two output numbers generate a first number and provide a second number having a plurality of digit places by subjecting the first number to a predetermined mathematical operation, and derive one of the two desired output numbers from a first digit place of the second number and the other of the two desired output numbers from a different second digit place of the second number.

Abstract: An utterance training machine comprises flow speed detector for converting the flow speed of expiration into an electrical signal to provide a flow speed signal, acoustic-electric converter for converting a voice into an electrical signal to provide a speech signal, an endless recording medium for recording and retaining thereon the speech signal and the flow speed signal, record-reproduce unit for causing the speech and flow speed signals to be recorded on the endless recording medium and for reproducing the recorded signals from the recording medium, set unit for setting the record-reproduce unit to record mode or reproduce mode, and display unit for recieving the flow speed and speech signals from the endless recording medium to display the waveforms of these signals on a screen when the record-reproduce unit is set to the reproduce mode by the set unit.

Abstract: A device is provided for teaching the operation of an electronic computer. The device includes a mock control panel display having an overall configuration and appearance substantially identical to that of the display of the actual computer. The mock display includes simulated light and control elements of like type and kind to those of the actual computer. A projector is provided, designed to project an image viewable from the front of the mock display thereby causing portions of the mock display to resemble an illuminated light array of the computer display.