Abstract: The proposed velocity-measuring device (1) can measure the velocity of a wide range of objects via simple sound waves utilising the Doppler-effect principle. The velocity-measuring device (1) consists of a base unit (10) with a command-display unit (17). The base unit (10) holds a sound wave emitter with no less than one loudspeaker (8), a sound wave receiver with no less than one microphone (9), a computing unit and a display screen. In order to measure velocities the device (1) shall be placed next to the projected object line of movement in such a way that the sound waves and the line of movement meet at an acute or obtuse angle. The sound waves striking the followed object shall be partially reflected and subsequently received by the microphone (9) of the receiver. The difference between the emitting frequency and the echo frequency shall be analysed within the computing unit, producing the object velocity. The calculated velocity shall be shown via the control-display unit (17).

Abstract: A filiform workpiece such as a metal wire is advanced at high speed, after passage through several pretreatment baths, in a vertically upward direction through a closed-ended nozzle of a crucible by way of a lower inlet aperture and an upper outlet aperture of that nozzle which is completely filled with a thermally fusible coating material (e.g. zinc). A guide tube adjustably seated in the inlet aperture has an inner diameter substantially equaling that of the workpiece to be coated whereas the outlet aperture, formed by a collar of a substance which is not wettable by the coating material, has a diameter about two to three times as large. A short residence time of less than 5.multidot.10.sup.-2 second for any given point of the workpiece in the molten mass holds down the temperature of the workpiece and results in rapid hardening of the coating material upon emergence from the bath.