(19)

(11)

EP 0 192 721 A1

(12)

(43) Date of publication: 03.09.1986 Bulletin 1986/36 (21) Application number: 85904468.0 (22) Date of filing: 06.09.1985

(51) International Patent Classification (IPC):  G01B 11/ 00( . ) G01B 11/ 02( . ) (86) International application number: PCT/GB1985/000401 (87) International publication number: WO 1986/001589 (13.03.1986 Gazette 1986/06)

(84) Designated Contracting States: CH DE FR GB IT LI SE (30) Priority: 06.09.1984 GB 19840022535 (71) Applicant: Renishaw plc Wotton-Under-Edge Gloucestershire GL12 8JR (GB)	(72) Inventor: CANNINGS, Frank, Ernest, Richard Cheltenham Gloucestershire (GB)