Pilot balloon theodolite

Meteorology

1939

Balloon theodolite by E.R. Watts & Son, pat.no.114

Meteorology

1917

Balloon theodolite by Cary, London, no.1994. Mark

Meteorology

1938

Balloon theodolite by Cary, London, no 1970, MO 26

Meteorology

Balloon theodolite by E.R. Watts & Son, London, No

Meteorology

1940

Balloon theodolite by Cary, London, no.2026. MO 75

Meteorology

1935

Balloon theodolite Mark D by Cary, London, no 1995

Meteorology

1935

Pilot balloon theodolite, Mk 4, with tripod

Meteorology

Pilot balloon theodolite by Cary & Co., London (in

Meteorology