(19)

(11)

EP 0 939 889 A1

(12)

(43) Date of publication: 08.09.1999 Bulletin 1999/36 (21) Application number: 97913330.0 (22) Date of filing: 24.11.1997

(51) International Patent Classification (IPC):  G01M 3/ 28( . ) (86) International application number: PCT/GB1997/003216 (87) International publication number: WO 1998/023936 (04.06.1998 Gazette 1998/22)

(84) Designated Contracting States: AT BE CH DE DK FI FR GB IE LI LU NL SE (30) Priority: 23.11.1996 GB 19960024384 04.07.1997 GB 19970014097 (71) Applicant: Meredith, Stephen, Charles Cheshire SK15 2UN (GB)	(72) Inventor: Meredith, Stephen, Charles Cheshire SK15 2UN (GB) (74) Representative: Pilch, Adam John Michael  D. YOUNG & CO., 21 New Fetter Lane London EC4A 1DA London EC4A 1DA (GB)