A straddle-cutting device for machining a pair of parallel surfaces on a rotating workpiece in a single cut as the cutting tool is advanced over the workpiece.Apparatus is provided for biasing the cutting tools using a stack of spring washers and a pneumatic power cylinder.

An attachment for a vertical mill having a quill and a spindle rotatably mounted within the quill which is adapted to rotatably drive one end of a milling cutter. The attachment includes an elongated housing having a semi-cylindrical cavity and in which one end of the housing is clampingly secured to the quill of the vertical mill. In doing so, the milling cutter is contained at least partially within the cylindrical cavity. A rotatable center is rotatably mounted to the other end of the housing and the center is positioned within a conical recess at the lower or free end of the milling cutter or, alternatively, a pilot on the cutter is rotatably received in the other end of the housing. The housing together with the center thus allows the cutter to freely rotate with the spindle while simultaneously supporting the cutter against lateral deflection with respect to its axis of rotation.

A liquid crystal device having a higher durability and a display quality less likely to be degraded, for example, for use in a glare shield reflection mirror. The liquid crystal device comprises: a pair of substrate plates, a liquid crystal layer filled between the pair of substrate plates, and an oblique evaporation film laminated on one of the substrate plates, wherein a protective layer is formed on the boundary surface between the oblique evaporation film and a neighboring component member. The oblique evaporation film has become less susceptible to the neighboring material, and problems, such a bluish oblique evaporation film due to the proton (H.sup.+) intrusion from the neighboring material, have been prevented. Thus the liquid crystal device has come to have a higher durability and a display quality less likely to be degraded.