Workshop micrometer for the blind (no. 412/62), with wooden carrying box and combination spanner, by Moore and Wright, Sheffield, South Yorkshire, England, 1950-1952. The Workshop micrometer for the blind (no. 412/62) is a standard micrometer, modified by the addition of an aluminium drum of geared serrated discs with braille characters: developed in 1951, in conjunction with the National Institute for the Blind.