(19)

(11)

EP 0 857 291 A1

(12)

(43) Date of publication: 12.08.1998 Bulletin 1998/33 (21) Application number: 96935080.0 (22) Date of filing: 24.10.1996

(51) International Patent Classification (IPC):  G01B 11/ 16( . ) G01L 1/ 24( . ) G01D 5/ 353( . ) (86) International application number: PCT/GB1996/002606 (87) International publication number: WO 1997/015805 (01.05.1997 Gazette 1997/19)

(84) Designated Contracting States: DE ES FR GB IT PT SE (30) Priority: 26.10.1995 GB 19950021957 (71) Applicant: BICC Public Limited Company London W1X 5FH (GB)	(72) Inventors: HAIGH, Neil, Richard Cheshire L62 9AD (GB) ROWLAND, Simon, Mark Cheshire CW6 0TP (GB) LINTON, Richard, Stephen Chester CH3 5HN (GB) (74) Representative: Poole, Michael John, et al  BICC plc Patents and Licensing Department Quantum House Maylands Avenue Hemel Hempstead, Herts. HP2 4SJ Hemel Hempstead, Herts. HP2 4SJ (GB)