Abstract: A dielectric constant sensing device of the present invention comprises a transmission line consisting of a first electrode formed of a conductor being wound like a longitudinal cylinder, a second electrode provided to be separated from the cylindrical surface of the first electrode at a predetermined distance, and a chamber for introducing a measured fluid between the first electrode and the second electrode, whereby a dielectric constant of the measured fluid can be sensed based on a rate of a pulse voltage wave propagated over the transmission line. Accordingly, the fluid dielectric constant sensing device which is able to attain high precision by a simple structure can be provided.

Abstract: A magnetic recording medium having on a non-magnetic support a magnetic layer mainly composed of a ferromagnetic metal powder and a binder resin is disclosed, wherein the specific surface area S (m.sup.2 /g) of the ferromagnetic metal powder is from 30 to 65 and the magnetic layer further contains a fatty acid ester in a content Y (% by weight) to the ferromagnetic metal powder of the range of 0.05S+5.5.ltoreq.Y.ltoreq.-0.2S+24 when the specific surface area S is from 30 to less than 50 and the range of 0.06S+4.7.ltoreq.Y.ltoreq.-0.13S+21 when the specific surface area S is from 50 to 65. The magnetic recording medium is suitable for high density recording and exhibits excellent running durability.

Abstract: Disclosed is a magnetic recording medium comprising a non-magnetic support having provided thereon a ferromagnetic metal thin film provided with a layer containing a compound having a mercapto group. This layer may also contain an ester bond. The magnetic recording medium shows improved running properties and wear resistance over wide ranges of temperature and humidity.

Abstract: A video signal transmission system wherein a television video signal is subjected to a waveform conversion in a video processing unit on a transmission side, then sent to a receiving side and restored in a restoring processing unit on the receiving side. The video processing unit comprises partly polarity inverts a composite video signal containing a horizontal synchronizing signal in accordance with a pseudo-random code utilizing a horizontal scanning frequency as a clock pulse such that the while level of an inverted video signal portion will not be smaller than a peak level of a non-inverted horizontal synchronizing signal portion. The restoring processing unit on the receiving side inverts again the polarity of the polarity inverted composite video signal portion in accordance with the pseudo-random code to obtain a restored composite video signal portion having the same polarity as the original composite video signal.

Abstract: An opthalmological instrument including a blinking detecting device for positively detecting when an eye is blinking to thereby eliminate errors in optical measurements due to variations in the signal light produced by the blinking. An optical system receives light beams reflected from a portion of an eye under examination to form an image of the front portion of the eye in an image plane. An image pickup element is disposed at the image plane and produces an output video signal in response thereto. A detecting circuit which receives the video signal determines whether or not the image pickup element exceeds a predetermined threshold value. If the threshold value is not exceeded, an indication is produced that blinking has occurred.