Abstract: In a bipolar pincette having two pincette arms (12.sub.a) which are connected at one end by a holding means and which are electrically insulated from each other, the holding means has two interconnected channel-like profile portions (24.sub.a) each of which is provided with two insertion slots or the like guide paths for a respective blade-like region or a gripping blade (20) of one of the pincette arms (12.sub.a) and bears against a longitudinal edge of the pincette arm or gripping blade. The channel-like profile portions (24.sub.a) are formed from ceramic material or metallic material; the latter is provided with an electrically insulating coating layer.

Abstract: A surgical instrument, in particular microsurgical scissors or cutters or tweezers or forceps, with a gripping portion and at least one gripping surface which extends over at least a section of the gripping portion and which affords enhanced friction in comparison with the adjacent sections of the instrument, is improved in that the gripping surface is in the form of a roughening with small, juxtaposed raised portions and depressed portions of different dimensioning and with an arrangement which is irregular in respect of dimensioning.

Abstract: An apparatus for precisely positioning materials test specimens within the optimum neutron flux path emerging from a neutron source located in a housing. The test specimens are retained in a holder mounted on the free end of a support pivotably mounted and suspended from a movable base plate. The support is gravity biased to urge the holder in a direction longitudinally of the flux path against the housing. Means are provided for moving the base plate in two directions to effect movement of the holder in two mutually perpendicular directions normal to the axis of the flux path.