Abstract: At the front end of an operating lever constituted as a joystick lever, a grip that is not allowed to rotate relative to the operating lever is attached. At the front end of the grip, a rotary operating member to be used for prime mover rotation speed adjustment is rotatably mounted. The operator rotates the rotary operating member with his finger tip while holding the grip and moving the operating lever to adjust the prime mover rotation rate and drive an actuator at the same time.

Abstract: An ultrasonic inspection and imaging instrument scans an object under examination, the object having an inspection plane at a predetermined depth, in the direction slanted to the depth (slant scanning), in such a way as to cause rectilinear scanning as viewed from the plane. Measured data on a peak value corresponding to each measurement point obtained from the slant scanning are displayed in the form of a picture on the screen of a display relative to each measurement point. The image displayed on the picturee at that time is most clearly demonstrated, provided an image portion in the vicinity of a test portion corresponding to a test surface is brought into focus in the depth direction.