Method and apparatus for testing dimension deviations of a travelling web. A light source is provided on one side of the web and rows of fibre optics are provided on the opposite side of the web. The fibre optics terminate in photo-detectors which produce an electric signal if the radiation path from the light source to the corresponding fibres is not intercepted by the web. The photo-detectors may be arranged in a matrix so that according to lines running parallel to the diagonal of the matrix ...

A three dimensional memory using materials switchable from an amorphous state to a crystalline state and back again to its amorphous state is realized by focusing a laser beam into different depths of the material. The material, when in its crystalline state, is capable of generating the harmonic of the frequency of the incident light used to interrogate its state, whereas in its amorphous state it is not a generator of harmonics. The detection of this harmonic allows for increased discriminatio...

A three-dimensional item that is foldable to a flat condition to facilitate mailing, storing and shipping thereof and is adapted to be opened to its three-dimensional condition in which the housing or container of the item constitutes a frame for elements which are comprised of one or more decoration-bearing transparent panels that are retained in parallelism to and between the front and rear faces of said housing. When arranged in open viewing condition, said item is retained in said condition ...

A two-dimensional pattern normalizer includes a first and a second shift register array disposed on a substrate of magnetic material, such as orthoferrite, said first array being disposed at a desired angle with respect to said second array; wherein an input pattern provided as a parallel bit train is written in said first shift register array and said pattern is read out through said second shift register array, and thus an output pattern rotated at the desired angle with respect to the input p...

A game apparatus comprising, in combination, an upright hollow column resembling an elevator shaft having indicia therealong representing a plurality of floors along the elevator shaft. There is a slot in the column at each floor. A plurality of playing pieces are positionable into said upright column, through the slots, each playing piece having indicia thereon correlated to at least one of said floors. A plunger is vertically movably mounted on said upright column and has a simulated elevator ...

A three-dimensional mirror tile is disclosed in which mirror segments are supported by a pyramid-like base which is attachable to a wall or similar flat surface. The periphery of the base is defined by an equilateral polygon having an equal number of sides N where N is a number equal to 3 or greater. in a preferred embodiment, N is equal to 4 and, therefore, the base has the form of a conventional pyramid. Alternatively, the tile and base may assume the shape of a frustrum or truncated pyramid, ...

A ski for use in cross-country or tour skiing. The running surface of the ski is characterized by a three-dimensional surface of protuberances. The protuberances are aligned in rows substantially transverse to the longitudinal axis of the ski. The protuberances of one row are offset from the protuberances of the preceding and succeeding rows to create a scale-like pattern. The protuberances are also nonharmonically spaced to eliminate pure tone-type noise attendant with regularly repeated patter...

A three-dimensional protractor for determining two angular dimensions and one linear dimension for an angular member having one leg attached to a first point and a second leg extending axially toward a second spaced-apart point. The protractor includes a mounting means having a first angle indicia thereon and a movable aligning pointer connected to the mounting means by a slidable shaft for determining a second angular relationship between the pointer and shaft, the shaft being movable axially r...

An improved three-dimensional combination toy may comprise a central part, a plurality of guide canopies installed above the central part to form guide spaces, (the guide canopies being laterally spaced apart from one another such that the spaces between the edges of adjacent guide canopies define guide tracks), seven movable blocks (each provided with a slide piece dimensioned to slide within and be retained by the guide spaces and attached to its block via an inwardly projecting slide leg free...

A drawing tool comprises a pair of transparent screens each defining a drawing surface on the underside thereof. A powderized etching composition is contained in a closed and sealed chamber beneath each drawing surface to fully coat the surface upon shaking of the drawing tool. An operator-controlled joy stick can be manipulated universally to simultaneously move drawing points along the drawing surfaces to scribe nearly identical two-dimensional designs thereon. An optical viewer mounted upon t...