(19)

(11)

EP 0 783 671 A1

(12)

(43) Date of publication: 16.07.1997 Bulletin 1997/29 (21) Application number: 95932824.0 (22) Date of filing: 28.09.1995

(51) International Patent Classification (IPC):  G01J 3/ 28( . ) (86) International application number: PCT/GB1995/002304 (87) International publication number: WO 1996/010163 (04.04.1996 Gazette 1996/15)

(84) Designated Contracting States: DE FR GB IT SE (30) Priority: 28.09.1994 GB 19940019557 (71) Applicant: BRITISH TECHNOLOGY GROUP LIMITED London SE1 6BU (GB)	(72) Inventors: BELTON, Peter, Stanley Norwich NR2 3QR (GB) WRIGHT, Kevin, Michael Norwich NR4 7NH (GB) (74) Representative: Buttrick, Richard  British Technology Group Ltd, 101 Newington Causeway London SE1 6BU London SE1 6BU (GB)