The rocker machine of the invention can be worked to produce uniformly engraved plates of any size and suitable for mezzotint engraving. In one embodiment, the transistor includes a sourcedrain including a lightly or heavily doped region adjacent the channel region, and an oppositely doped well extending under the channel region and a portion of the lightly or heavily doped region of the sourcedrain. The capillary may be moved downwardly to form a preliminary compressed ball on a first pad using the ball. As another aspect of the X-rays CT apparatus, there is provided an operation unit configured to operate a position of the X-ray radiation source. The blade tip clearance detection system is configured to generate a first detection frequency configured to pass through the material to detect the position of a target structure, generate a second detection frequency configured to reflect from and detect the reference point, and determine a position of a surface approximate to the target structure based upon the reference point.