For sale is a beautiful, highly precise collection of 9 antique professional civil engineering and land surveying scale rules. Manufactured in England during the late Victorian to Edwardian era (circa 1890s–1920s), this collection remains in exceptional, pristine "as new" condition. The timber features a gorgeous, uniform rich honey-colored boxwood patina with incredibly sharp edges and flawless legibility.

While individual rules do not bear a specific manufacturer stamp, the absolute mechanical precision of the line incisions and the distinctive fonts confirm they were produced by a premium British instrument house for trade-professional use.

Technical Highlights:

• Engine Divided Construction: Every marking and conversion ratio was mechanically incised using early workshop dividing engines rather than stamped, guaranteeing exact proportions for cartographers and drafters.
• Specialised British Cartography Scales: Includes rare mapping configurations used historically across the British Empire, including dual-readout scales for Gunter's Chains & Links (featuring 66, 70, and 99 Chains layouts) alongside standard Imperial feet and yards.
• Ordnance Survey Ratio: Includes a highly collectible 1/63360 scale rule, specifically calibrated for mapping standard UK and colonial geography grids at exactly "One Inch to One Mile".
• Complete Alignment Set: The lot features 7 fully graduated rules paired with 2 original matching blank boxwood offset packer scales (slip scales). Cartographers used these blank sliders to calculate right-angle coordinates without dragging ink across delicate map vellum.

This is a magnificent, ready-made layout display for an industrial design studio, executive desk, or an advanced technical heritage tool collection.

• Quantity: 9 Pieces Total (7 Precision-Graduated Scales, 2 Blank Offset Sliders)
• Material: Selected Antique Boxwood (Stamped "Made in England")
• Era: Circa 1890s – 1920s
• Dimensions (Per Rule): 33cm Long x 3cm Wide x 3mm Thick
• Total Combined Weight: 300g
• Condition: Excellent / Near Mint (perfect straight edges, no warp, no cracks, minimal shelf wear)

• Collection: Available for local pickup from Thornleigh, NSW 2120
• Postage: Securely wrapped, tracked, and insured parcel shipping available anywhere in Australia or worldwide (buyer postage cost calculated at checkout).