(19)

(11)

EP 0 295 255 A1

(12)

(43) Date of publication: 21.12.1988 Bulletin 1988/51 (21) Application number: 87901547.0 (22) Date of filing: 20.02.1987

(51) International Patent Classification (IPC):  G01K 3/ 04( . ) G04F 1/ 00( . ) (86) International application number: PCT/GB1987/000128 (87) International publication number: WO 1987/005102 (27.08.1987 Gazette 1987/19)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 24.02.1986 GB 19860004477 08.04.1986 GB 19860008518 22.12.1986 GB 19860030584 (71) Applicant: SCIENTIFIC APPLIED RESEARCH (SAR) PLC. Middlesex HA2 OLS (GB)	(72) Inventors: JOHNSON, William, Nevil, Heaton London NW3 (GB) CHAPMAN, Christopher Ottery St. Mary Devon (GB) (74) Representative: Howden, Christopher Andrew, et al  FORRESTER & BOEHMERT Franz-Joseph-Strasse 38 D-80801 München D-80801 München (DE)