Hitachi, Ltd.

Mitsuo Taguchi

Tadahiko Miyoshi

Hiromi Kagohara

Mitsuo Nakagawa

Masanori Yoshikawa

A rolling roll comprises a metal rolling roll body, a ceramic sleeve into which the roll body is inserted with a gap therebetween, thereby providing a working surface of ceramics at an outer periphery thereof, fasteners provided on the roll body at both sides of the sleeve for pressing the side faces of the sleeve thereby to fix the sleeve to the roll body, and at least one spacer having a larger coefficient of thermal expansion than that of the roll body and inserted between the sleeve and the fastener so that the sleeve is axially pressed by the fastener to fix the sleeve to the roll body.

Ceramic sleeve incorporated rolling roll

The gas detection offered by the present invention is characterized by the detection of CO as distinct from H.sub.2. The optimum structure of the device therefor has an electrolytic cell wherein the electrode surfaces of a working electrode, a counter electrode and a reference electrode are kept in contact with electrolyte and wherein the open sides at both ends of the vessel containing the electrolyte are sealed by the working electrode, the counter electrode and the reference electrode; means for connecting between the working electrode and the counter electrode and means for applying a predetermined a voltage between the working electrode and the reference electrode, wherein sensitivity of the working electrode to carbon monoxide and hydrogen gas is smaller than that of the reference electrode.

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Iwaki, Japan

Mitsuo Taguchi