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A new scalar field called a measure field is proposed which plays a role of measure assigned to each world point. By measuring all the quantities with a standard given by the above-mentioned measure field, it is shown to be possible to write all the field equations in a manifestly gauge-invariant manner. Weyl's gauge field, when written in this fashion, is proved to have a negative energy density and has a techyon-like property inside material particles. It is shown, however, that such a strange field cannot come out of the matter.
R. Utiyama (Sat,) studied this question.