An apparatus can measure characteristics of a formation surrounding a borehole. for producing magnetic structures by printing magnetic pixels into a magnetizable material. The center diamond is placed at a level below that of the four corner diamonds and is supported by a rim such that the center diamond does not have to rely on the corner diamonds for support. The rib extends over substantially the entire outer surface of the clamp body and distributes loads applied to the mount point over the entire clamp body and to the gripper assembly. The soft-off unit softly turns off the IGBT according to an output signal that the GVPA outputs when a fault has occurred. A chute inlet is defined in a forwardly facing location of the housing, proximate the rear sliding window, and for receiving in inserting fashion items deposited by individuals seated within the cap portion.