James Farrow Pilot Balloon Slide Rule Mk. I code: 794/40

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Country of manufacture: England,            Date of manufacture: ____
Overall length: 62.9 cm,          Width: 5.6 cm,           Weight: 383.8 gms.
Materials: Celluloid/wood laminate
Cursor:Three separate cursors, one on top stator and two on bottom stator, each 3.8 X 2.2 X 1.7 cms; plexiglass and brass; lines = single hairline each, front only.
Gauge Marks: [       ]
Condition: C4 (Minimal signs of use but some discoloration on cursor brass; without manual)
Came with: Wooden storage case
Notes: Assumes the use of a UK Met. Office Pattern Pilot Balloon Theodolite. See Martin Brenner's Pilot Balloon Resources website.

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