1900s Victorian Antique English Nautical Rolling Ruler, Maritime, Draughtsman, Captain Field

Kelvin & Hughes Brass Rolling Parallel Ruler

Antique and Vintage Navigational Instruments – London Fine Antiques

Antique Scientific Instruments

Brass Parallel Marine Rolling Rule

Parallel Ruler – Captain Field, 19th century - Archipel

Antique Nautical Rolling Ruler, English, Maritime, Draughtsman, Captain Field For Sale at 1stDibs

Antique Nautical Rolling Ruler, English, Maritime, Draughtsman, Captain Field For Sale at 1stDibs

The Project Gutenberg eBook of From Midshipman to Field Marshal, by Evelyn Wood.

1920s Antique English Draughtsman's Rolling Ruler, Cartographer's Instrument, Stanley

An Old-School Folding Ruler - Small Boats Magazine

Antique Maritime Parallel Rules for sale

Roar of Distant Breakers Marriott Library