BRL Pilot Balloon Mk. IV A

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Country of manufacture: England,            Date of manufacture: 1959
Overall length: 62.9 cm,          Width: 6.3 cm,           Weight: 675.1 gms.
Materials: All plastic body
Cursor:Four separate cursors, two on top stator and two on bottom stator, each 3.8 X 3.2 X 1.2 cms; plexiglass and brass; lines = single hairline each, front only.
Gauge Marks: [       ]
Condition: C3 (Very minimal signs of use but some discoloration on cursor brass. Also without manual, and wooden case lid is warped)
Came with: Wooden storage case
Notes: Assumes the use of a UK Met. Office Pattern Pilot Balloon Theodolite (Watts Mk IIII or V).
See Martin Brenner's Pilot Balloon Resources webpage

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Imprinted on back of rule:              Label affixed to top of wooden storage box: