Abstract: The invention concerns a measuring transducer, of the type comprising a rigid support case, a rule in the form of a thin steel tape, pretensioned and suspended at its ends in the support case and having etched thereon the graticule of a measuring scale, as well as a rule reading head mounted in the case slidable along the tape. According to the invention, at least one tensioning bar is fixed to the case at a single point and is freely expansible in respect thereof for the remaining part, through the effect of temperature, the ends of the thin tape of the rule being anchored to the ends of said bar.

Abstract: The invention relates to a transducer for the micrometric measurement of linear quantities comprising a support rule, a scale in the form of a very thin continuous metal tape which is kept suspended at its ends under a predetermined constant tension and on which the measurement notches are directly engraved, and a reading head comprising a tape guide groove in which the tape slides freely during the movement of the head relative to the support rule.