(19)

(11)

EP 0 892 930 A1

(12)

(43) Date of publication: 27.01.1999 Bulletin 1999/04 (21) Application number: 97915609.0 (22) Date of filing: 04.04.1997

(51) International Patent Classification (IPC):  G01T 1/ 20( . ) G01T 1/ 02( . ) (86) International application number: PCT/GB1997/000961 (87) International publication number: WO 1997/038328 (16.10.1997 Gazette 1997/44)

(84) Designated Contracting States: AT BE CH DE ES FR GB IT LI (30) Priority: 04.04.1996 GB 19960007209 (71) Applicant: Eev Limited Chelmsford, Essex CM9 2QU (GB)	(72) Inventor: ROBBINS, Mark, Stanford Brentwood, Essex CM14 4PB (GB) (74) Representative: Cockayne, Gillian  GEC Patent Department Waterhouse Lane Chelmsford, Essex CM1 2QX Chelmsford, Essex CM1 2QX (GB)