A high speed multicolor printing machine using an ink ribbon having on its surface colored stripes or bands of two or more different colors, whereby for printing a certain line in a color different from the other lines, the particular ribbon color in which to print is selected out and the stripes of said particular colors are accurately positioned in alignment with the printing types to print in the particular color.

A monolithic crystal filter comprising a piezoelectric plate, main electrodes and an intermediate electrode provides attenuation pole characteristics at a desired frequency. The mass and thickness of said intermediate electrode are larger than those of said main electrode, that is to say, the drop in frequency due to said intermediate electrode is larger than that due to the main electrodes.

A method and apparatus for analyzing sound ray paths of a sonar system by an analog computing method is disclosed wherein the transmission loss (Nw) of a sound wave is compared with the value of a figure of merit (N.sub.FM) of the sonar system. Sound rays within the detection range of the sonar system are displayed by solid lines while sound rays out of the detection range are displayed by broken lines. Thus ray paths and detection ranges of the sonar system are displayed at the same time.

The cooperating contacts of a reed switch are made of rhodium oxide. Such contacts are prepared by plating rhodium on the reeds of reed switches and then oxidizing the surface layers of the plated rhodium contacts by heating them in an oxygen containing atmosphere at a temperature of from 380.degree. to 580.degree. C for 3 to 15 minutes.

A negative resistance oscillator consisting of two parallel waveguides coupled together by a directional resonator. The electric coupling point between the resonator and the waveguides is spaced n.lambda./4 from a negative resistance element mounted near the end of one of the waveguides, where n is an integer and .lambda. is the wavelength of the center frequency of the oscillator.

In apparatus for measuring the diameter of a fine wire of the type wherein parallel laser beams are projected upon the fine wire in the diametric direction thereof so as to form a Fraunhofer diffraction image and the spacing between the peak bright spots of the diffraction image is counted, there are provided an optical filter for making the level of the signal at the optical center of the Fraunhofer diffraction image to be equal to the level of the signal subjected to a predetermined number of ...

The cooperating contacts of a reed switch are made of rhodium oxide. Such contacts are prepared by plating rhodium on the reeds of reed switches and then oxidizing the surface layers of the plated rhodium contacts by heating them in an oxygen containing atmosphere at a temperature of from 380.degree. to 580.degree.C for 3 to 15 minutes.

In a magnetic memory device having row windings and, orthogonally aligned word windings, the row windings are arranged in a plurality of parallel planes, with the end of each row winding in the top-most plane being connected at one end to an associated row winding in the next plane therebeneath, the opposite ends of these row windings being connected to the adjacent end of the next plane of row windings therebeneath, and so forth, so as to create an undulating orientation of the row windings. Ea...

A pulse interpolation system with high speed operation and improved linearity is described. An interpolation pulse train having "one" in all bit places is applied to the axis with the largest incremental command. On the other hand, the interpolation pulses to the other axes are obtained from a basic pulse train which is similar to a pulse train obtained by a prior DDA system. The basic pulse train is modified according to the results of the calculation of the interpolation before being applied t...

An improved simplex ARQ system for data transmission circuits using a short wave circuit is provided. A block of characters is sent from a master station to a slave station and if an error occurs during the transmission, said block of characters is automatically re-transmitted, thus clean output without an error is obtained on a printer in a receiving or slave station. The length of said block is changed according to the instantaneous quality of the short wave circuit, and thus the actual transm...