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Pilot Balloon Slide Rule Mk IVA, English, 20th Century

preview image for Pilot Balloon Slide Rule Mk IVA, English, 20th Century
Inventory Number: 74297
Object Type:
Persons: B.R.L.?
Date Created: 20th Century
Place Created: England United Kingdom Europe
Accession Number: 1992-26
Brief Description: Straight slide rule for wind vector calculations, with case. Long narrow rectangular wooden box with a hinged lid hook latches. Paper label screwed onto box lid. Blue textile lining. Containing white plastic and brass sliding rule.
Primary Inscriptions: "B.R.L." logo stamped on upper stock and "PILOT BALLOON SLIDE RULE, MARK IVA [MO monogram] 2777/56 MET. REF. No. 868 A" stamped on lower stock (and clear overlay). Plaque on case lid "PILOT BALLOON SLIDE RULE, MARK IVA / MET. REF. No. 868.A"
Provenance: Presented by the Rutherford Appleton Laboratory in 1992.
Collection Group:
Material(s): Metal
Height Width Depth Diameter Unit
48 652 93 mm


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