Pooleys Transparent NNM030 NM-3 Scale Rule (16 INCHES)
Outside edges respectively read 0–110nm in 1:500,000 and 0–220nm in 1:1,000,000. Centre scale converts between Statute Miles (sm) 0–115sm and Nautical Miles (nm) 0–100nm.
|Name||Pooleys NM-3 Scale Rule|
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