Abstract: A medical instrument for measuring depth of fastener hole in bone. The depth gauge has a scale tube which fits into fastener hole in bone. The zero index of scale tube expands exclusively in radial dimension to a diameter greater than the hole diameter, affording a positive stop for the zero index, thus insuring precise alignment of scale zero index with edge of hole in distal bone wall. A sliding scale marker is frictionally mounted to scale tube, affording a record of the measurement.

Abstract: An equipment lockdown apparatus for locking pieces of equipment such as computer modules, typewriters or the like is disclosed. The apparatus includes a sub-base suitably secured to a desk or other supporting structure and which supports the remainder of the unit for rotation. A base shelf is included together with a pedestal which rotatably supports thereon one or more additional shelves for rotation. Shields are positioned adjacent each shelf to preclude access to fastening elements for the pieces of equipment on each shelf and a key-controlled locking mechanism holds the entire unit in assembled relation thus precluding access to the fastening means whereby the pieces of equipment are securely locked.

Abstract: A method and resulting laser tube apparatus constructed from a plurality of components adapted to be arranged in axial alignment and selfsupporting with respect to each other. The elements are adapted to withstand high baking temperatures and are provided at their mating surfaces with material capable of forming a flowable seal between the components during baking and subsequently solidifying to a hermetic seal upon cooling. End adjustment mirror mountings which combine adjustable functions together with desirable electrical properties are also disclosed, together with procedures for obtaining optical alignment of the resultant tube product.

Abstract: A method and resulting laser tube apparatus constructed from a plurality of components adapted to be arranged in axial alignment and self supporting with respect to each other. The elements are adapted to withstand high baking temperatures and are provided at their mating surfaces with material capable of forming a flowable seal between the components during baking and subsequently solidifying to a hermetic seal upon cooling. End adjustment mirror mountings which combine adjustable functions together with desirable electrical properties are also disclosed, together with procedures for obtaining optical alignment of the resultant tube product.