Two vertically offset thermistors for sensing a fluid such as oil and refrigerant in a compressor shell are monitored by a method that takes into account rapidly changing conditions within the shell. The product is placed in a container, and a closure is installed on a container. The resulting memory element can be driven by a CMOS steering element. The enlargement rate is distributed to each ER unit in accordance with the copy mode, decided use priority order, and the ER rate upper limit value of each ER unit. The parallel lines are perpendicular to the connecting line between the two interfaces of the optical axes of the optical paths with the one plane, which intersects the optical axes under the same angles. A radius of curvature of the core member side journal portion of the core member is made greater than a radius of curvature of the cap side journal portion of the bearing cap in such a manner that a clearance between the cap side journal portion and the core member side journal portion is larger than a clearance between the core member bolt hole and the cast-off pin.