Abstract: The invention relates to a display rack for shades of nail varnish, comprising a support and colored tabs which are mounted on the support in a mobile manner, independently from each other.

Abstract: Provided is an apparatus for teaching calculation skills. The apparatus may include a plurality of beads and a set of columns of the cells being configured to be occupied by one of the beads. The apparatus may include a set of sensors configured to determine occupation of the cells by the beads, and a processing unit electronically coupled to the set of sensors. The processing unit can be configured to: receive from a server at least one array of integer numbers. Each of the integer numbers represents an intermediate result of solving of a sequence of mathematical operations displayed to a user; determine, via the set of sensors, occupation of the cells by the beads; translate the occupation of cells to a check number; and compare the check number to a current number in array to determine whether the current operation is solved correctly.

Abstract: An improved method of teaching mathematics which enables students to take an active and enjoyable role in their own learning via an interactive puzzle is disclosed. In the preferred embodiment, each of the ten digits, zero through nine, is “hidden” within one of ten value positions (52). Students must deduce the value of each position by forming sums, differences, products, and/or quotients of the positions. Freedom of selection of positions and operations provides for individualized approaches to puzzle solutions, and the interplay of values and operations promotes number sense. Mathematical reasoning is intrinsic to the puzzle. Programmable settings (72) allow the teacher to modify the puzzle, including substituting more challenging values in place of the digits (98), supplying more complex functions (106) in place of the four elementary arithmetic operations, and adjusting the format of the answers.

Abstract: A universal role playing game elevation indicator system for efficiently indicating elevation measurements of playing pieces used in role playing games. The universal role playing game elevation indicator system includes a support member having a lower end and an upper end, a plurality of multiplication indicia and elevation indicia positioned upon the support member, a first band movably positioned about the support member for indicating the multiplication rate of a character's elevation number, and a second band movably positioned about the support member for indicating the elevation of a character. The support member is comprised of an elongated and straight structure. The upper end is flat and level for receiving a figurine representing the character. The support member has a cross sectional size small enough to fit within a space upon a game board.

Abstract: An apparatus and method for teaching mathematics to children is disclosed. In one embodiment, the apparatus comprises a flat, ruler-like rod having expressed on one face a vertically arranged base-ten number line; lips at the ends of the rod; spaced-apart grooves on the back face of the rod; and an attached sleeve sized to snugly accommodate the rod and to slide thereon while indicating respective numerals on the number line. The sleeve is prevented from being separated from the rod by the lips on the rod. The sleeve has a transparent portion to frame individual numerals on the number line as the sleeve slides along the rod. On the inner portion of the reverse side of the sleeve a projection made of flexible material strikes the interior portion of individual grooves as the sleeve slides along the rod. In operation, the apparatus provides an audible and felt “click” as the sleeve passes over each numeral.

Abstract: An electronic abacus calculator comprising an electronic abacus display screen in combination with a numeric display and an electronic keyboard calculator. The invention also comprises a personal abacus, which comprises a mechanical abacus or an electronic abacus calculator or both in a suitable carrying case, which is designed to open and make the abacus available for use in the case.

Abstract: An apparatus and method for teaching mathematics to children is disclosed. In one embodiment, the apparatus comprises a flat, ruler-like rod having expressed on one face a vertically arranged base-ten number line; lips at the ends of the rod; spaced-apart grooves on the back face of the rod; and an attached sleeve sized to snugly accommodate the rod and to slide thereon while indicating respective numerals on the number line. The sleeve is prevented from being separated from the rod by the lips on the rod. The sleeve has a transparent portion to frame individual numerals on the number line as the sleeve slides along the rod. On the inner portion of the reverse side of the sleeve a projection made of flexible material strikes the interior portion of individual grooves as the sleeve slides along the rod. In operation, the apparatus provides an audible and felt “click” as the sleeve passes over each numeral.

Abstract: An educational instrument for numbers for providing students with an educational tool that would be fun and challenging. The educational instrument for numbers includes a base member having a top side, a recessed portion in the top side, a first longitudinal slot, a second longitudinal slot, a first longitudinal groove extending from the recessed portion and terminating near a first end of the base member, a second longitudinal groove extending from the recessed portion and terminating near a second end of the base member, a matrix of numbers disposed in the recessed portion, a first cover means slidably disposed in the first longitudinal slot and movable over the recessed portion, and a second cover means slidably disposed in the second longitudinal slot and movable over the recessed portion and over the first cover member.

Abstract: The invention provides an oven which can be used to rapidly heat and cool a workpiece. In one embodiment, the oven includes a first duct which defines an initial leg of an enclosed air flow path and which has an inner panel and a heat exchanger. This first duct has an inlet end and an outlet end, the inlet end of which is connected to a temperature-controlled air supply. The oven also includes a second duct which defines a final leg of the enclosed air flow path and which has an inner panel spaced from the first duct's inner panel to define an oven cavity. The oven also has a connecting conduit connecting the outlet end of the first duct to the second duct and which defines an intermediate leg of the enclosed air flow path. In a preferred embodiment, the first duct is the lower of the two ducts and includes a plurality of holes through at least the inner panel of the duct.

Abstract: A teaching aid computer, requiring no electrical or spring power, designed for elementary and middle school students, that when properly set and manipulated, provides real number solutions to equations involving multiple degree, as well as single degree unknowns. Parallel, interconnecting balancing beams are marked so as to provide adjustable positions for weights, whose resultant torques represent equation constants and coefficients of each degree of the unknown quantity. Further, by positioning and clamping movable axes beams, students can see and feel the results of adding or subtracting a few, or a series of numbers. Also, sliding beams, as well as sliding weights captively located in channels of each beam, with no required extra loose weights, allow simple decimal settings and answers to equations involving multiplication, and division.

Abstract: An electronic learning device (10) for teaching how to handle money is provided. A student provides input to the device, in a preferred embodiment, by a plurality of keys (40) which select the learning activity and its difficulty level. In certain activities, the device (10) requests (visually and/or auditorily) the student to engage in randomly selected currency identification/manipulation problems. The student's response is compared with the correct response, and the information concerning the appropriateness of the response is provided to the student. In the case of erroneous response, the correct response can be presented to the student both arally and visually. A speech synthesizer (28) (and/or visual display)) (20) serve to generate a reguest to the student concerning the student's response.

Abstract: A hand-held calculator for use in conducting classroom demonstrations of the operation thereof, including use of the operation instruction key means. The calculator comprises a frame, a keyboard section, data processing means and a display section and where both the keyboard and display sections are transparent to permit images thereof to be projected on a screen for teaching purposes.

Abstract: A psychograph, of a type employing a movable indicator to designate indicia on a principal part of the device such as a board, can be constructed so that the indicator will cause a switch to close each time it points to or otherwise designates an indicia. A circuit is used to provide an output in the form of a signal capable of being stored or used by a computer, an electronic typewriter or the like when a switch is closed for a pedetermined time interval. Normally the board or similar part of the device will carry a plurality of indicia and a separate switch will be associated with each so that signals corresponding to all of the indicia can be obtained.

Abstract: A children's educational apparatus comprising a driving member and a control member. The driving member includes a driving roll and two driven rolls, all which rotate together. A set of cards is set on each of the driven rolls, cards in one set being printed with mathematical questions and cards in the other set being printed with the solutions corresponding to those questions. The control member includes pressing keys on a keyboard, each of which is marked with a number on the upper face thereof and connects to a keying arm. When pressing the keys on which correct members corresponding to solutions of the mathematical questions are marked, the keying arms will be forced to move, thus forcing a pushing element to push the driving roll to rotate, then changing the cards to the next one.

Abstract: A correct answer displaying device for an arithmetic practicing device or the like. Plural chambers are arranged in matrix form with partition boards, and a colored transparent plate is placed over the chambers on which numerical problems to be solved are indicated and through which the configurations of the correct answer numbers cannot ordinarily be observed. Answer levers are operated to cause white plates to come near the lower surface of the colored transparent plate to display the correct answers. The white plates are pivotally mounted about one side thereof in which an engaging step is formed. Each answer lever, which has an engaging protrusion engaged with a respective engaging step, is accommodated in a guide frame in such a manner that the answer lever can pass in and out of the corresponding chamber.

Abstract: A teaching machine comprising circuitry to select and a display to present problems to a student, switches to receive said student's response, circuitry to determine if the answer is correct and, in one embodiment, an electronic game to reward said student for correct response by allowing said student to play a game. The same machine also having, in one embodiment, circuitry for detecting and concentrating on student's problem areas using a recurrence probability associated with each of a plurality of problems, whether math, spelling, or other, which is modified by the response of the student depending on said student's speed and correctness. Each problem to be presented to said student being selected in a random type manner using the probabilities associated with each problem. The teaching machine also having, in one embodiment, circuitry to modify the time in which the student is allowed to answer based on said student's response.

Abstract: A multi-modal automated educational and entertainment device having improved functional versatility and which requires relational positioning of input data by the user which corresponds to required manual operations and procedures. The device comprises a tablet having a non-relational section for input of control or predefined information and at least one relational section for input of data, a stylus for activating the non-relational and relational sections of the tablet, a microcomputer logic unit for processing signals from the non-relational and relational sections of the tablet, and a memory unit for storing programs and data base for determining the accuracy or inaccuracy of the signals provided the microcomputer logic unit. Visual and audio outputs can also be provided for operator reinforcement and a power source for activating the device. A sequence of steps for operating the multi-modal automated educational and entertainment device under the control of stored programs is also provided.

Abstract: An electronic learning aid of the type having a keyboard, a display at which problems are posed, a circuit for posing problems at the display, and a circuit for comparing proposed answers entered at the keyboard with correct answers, is provided with a timing circuit for measuring elapsed time while a set of problems is being posed to an operator of the learning aid. The timing circuit is preferably arranged to actuate different segments of a timing character in the display when the timing circuit is performing its timing function. The timing circuit is also preferably arranged to actuate, at the conclusion of a set of problems, the display to provide an indication to the operator of the learning aid the total elapsed time taken in solving the set of problems.

Abstract: An electronic self-study device in which problems are randomly generated comprises input keys by means of which a user inputs an answer to a displayed problem, and a review key which is depressed by a user to again display a problem incorrectly answered by the user. The device includes a judging means which judges whether or not the answer inputted by the user is correct, and a problem storing means is responsive to the judging means for storing a problem to which a wrong answer has been inputted. Further provided is a problem read-out control device which is responsive to operation of the reviewing key for causing the problem to which an incorrect answer was given to again be displayed so that the user may again answer the problem to which an incorrect answer has been given.

Abstract: An electronic learning aid is provided with a display, a keyboard and circuits for posing a set of problems at the display and for comparing the operator's responses entered at the keyboard with correct solutions to the problems. A memory is provided for counting the total number of problems posed and the number of problems answered correctly. A circuit is provided for actuating the segments of the display with one of at least two different display presentations depending on the difference, if any, between the number of problems posed and the number answered correctly. The display presentations are fanciful actuations of the segments of the display of differing complexity of duration. The display presentations give the operator a "reward" for answering the set correctly. Also, particular display presentations may be initiated after each correct answer is entered.

Abstract: A multiplication study device for teaching a student multiplication skills by operation of push-buttons mounted in a box-shaped case. The push-buttons are each provided with a semi-transparent see-through surface which permits the appearance therethrough of an answer to a multiplication problem when the push-button is depressed so as to come into contact with a projecting member disposed therebelow. A plurality of the push-buttons are mounted in the case, and the case includes a rear cover for mounting the projecting members. A common resilient member in the form of a urethane plate is employed for normally urging the push-buttons in an upward direction.