(19)

(11)

EP 0 046 747 A1

(12)

(43) Date of publication: 10.03.1982 Bulletin 1982/10 (21) Application number: 80900499.0 (22) Date of filing: 24.03.1980

(51) International Patent Classification (IPC):  G01N 29/ 24( . ) (86) International application number: PCT/GB1980/000053 (87) International publication number: WO 1980/002074 (02.10.1980 Gazette 1980/22)

(84) Designated Contracting States: AT CH DE FR NL (30) Priority: 23.03.1979 GB 19790010266 (71) Applicant: BALTEAU SONATEST LIMITED Milton Keynes, Buckinghamshire, MK12 5QQ (GB)	(72) Inventor: DICKSON, John Kidd Buckinghamshire (GB)