(19)

(11)

EP 0 231 323 A1

(12)

(43) Date of publication: 12.08.1987 Bulletin 1987/33 (21) Application number: 86904873.0 (22) Date of filing: 05.08.1986

(51) International Patent Classification (IPC):  G01N 3/ 30( . ) (86) International application number: PCT/GB1986/000474 (87) International publication number: WO 1987/000919 (12.02.1987 Gazette 1987/04)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 06.08.1985 GB 19850019692 (71) Applicant: The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and London SW1A 2HB (GB)	(72) Inventor: GILMORE, Raymond, Bewick Hampshire (GB)