A parametric magnetic reproducing head consists of a reproducing head and a timevariable capacitor connected in parallel. It is a flux response-type head. The amplitude of the output voltage is dependent of the signal frequency and proportional to the signal field. In this paper, mpgnetic tape recotdet configuration and chpracteristics for low-frequency signals with this head are described. It is also reported that this recorder is suitable for long-time recording and short-time reproduction. It is clear that it has excellent characteristics at a low-frequency range and is very useful for the application of long-time recording and short-time reproduction of an ultralow-frequency signal.

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For the linear displacement measurement in industrial machines, a linear scale using a magnetic phenomenon is superior to environment-resistance. An absolute-type magnetic scale has the feature of providing safety of a position information with high reliability. Until now, an absolute-type magnetic scale writes a position information at plural parallel tracks. The scale becomes large-sized for a long measuring length. Furthermore, a fine magnetic pattern of the scale is needed for a high resolution. From the practical viewpoint, however, the fine pattern makes the clearance of detecting head and scale small. For the solution of these problems, a new magnetic scale is proposed where an absolute position information is written at series on one track accompanying a parallel incremental track. The scale is expected to be small-sized and to show a high efficiency having a long measurement range without decreasing accuracy and resolution. from the above, the new absolute-type magnetic scale with absolute track is made where the position-information is written in at series by using nonrepeated codes and with a parallel incremental track.Furthermore, the operation and structure, performance characteristic are clarified. The operation characteristics of the scale are measured, and the response speed and the position accuracy are discussed.

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