Porritt, T.E. 1993 Report of calibration of a graticule. Lower Hutt: Institute of Geological & Nuclear Sciences Institute of Geological & Nuclear Sciences science report 93/22 2 p.
Abstract: A glass graticule manufactured by Peak, having various types of scale and a millimetre scale of 20mm length engraved 10-0-10 mm in 0.1mm graduations. (auth)