Full Details

Name and Model Number I. R. & H. Stebbing
Country of Origin England, High Street Southampton
Date of Manufacture Believed to be about 1835
Front Scales Trig scales, SIN TAN MER LEA RUM CHO
Back Scales Measuring scales with two verniers
Scale Length 30 cm (12 inch)
Type of Rule Slide Rule
Construction Boxwood scales laid out by dividing engine, numbers and letters hand stamped. Starting and gauge points have embedded brass divider point locations.
Area of Use Nautical
Comment Gunterís Scale or Gunterís Rule. Gunter was first to lay out logarithmic scales on a stick Ė like this rule. Application was usually navigation or astronomy calculations.
Rarity RRR
Donor Collection of Clay Castleberry
Match Number 372
(Click Picture for Details)

In conjunction with our 'donors' we assign a rarity rating to each item, based on the system devised by Herman van Herwijnen
(1929 - 2004), renowned Dutch collector, author, and creator of Herman's Archive, a collection of 5,000 slide rule images on CD.
• RR = Rare - 1 of 25 collectors has one; it may take a year to find an example in the marketplace.
• RRR = Very Rare - only a few known to collectors; may be several years before it comes up for sale.
• RRRR = Extremely Rare - a museum piece; unlikely that an example will come up for sale.