Vintage Slide Rule LL1 LL2 LL3 Log Log Scale with Cursor – Engineering/Architect Calculating Tool
Viridian Eclection
The Piece
A vintage slide rule carrying advanced log log scales, marked LL1, LL2 and LL3, alongside its logarithmic scales.
It is built on a dual rail frame with a clear sliding cursor, which allows precise alignment across several scales at once. The frame is metal with printed scale inserts.
The scales remain legible and the cursor moves smoothly across the rails. Light wear is present, consistent with age, and the whole is clean and intact.
It is housed in its original fitted case.
History & Provenance
Slide rules were the standard calculating instrument of engineers, architects and technical professionals through the middle of the twentieth century, in the decades before electronic calculators came into general use.
The presence of log log scales marks this out as an instrument intended for more advanced work, including exponential functions and higher level mathematics, rather than for basic student use.
The period of the 1940s through the 1960s is arrived at from the construction and the scale layout.
Product Details
| Form | Slide rule, engineering calculating instrument |
| Era | c. 1940s to 1960s |
| Scales | Logarithmic with log log scales LL1, LL2 and LL3 |
| Frame | Dual rail construction |
| Cursor | Clear sliding cursor for precision alignment |
| Materials | Metal frame with printed scale inserts |
| Case | Original fitted case included |
| Marks | Scale markings LL1, LL2 and LL3. Maker's mark to be confirmed |
| Condition | Good vintage condition, light wear consistent with age. Cursor moves smoothly and scales remain readable |
| Use | Engineering, scientific calculation, collectible display |
| Dimensions | To be confirmed |
Why It Belongs in Your Home
A slide rule is a legible object. The scales are printed to be read, and laid on a desk or a shelf it carries the look of precision without needing explanation.
It suits a study, a drawing office, or a shelf of scientific instruments, and it presents as well displayed as it does in the hand.
For collectors of scientific instruments, engineering tools, or mid century technical design, the log log scales make it the more interesting end of the type.
Every piece is packed with professional-grade materials: multiple foam layers, double-boxing, directional and fragile handling labels. For large furniture we use custom timber crating. We photograph packing before dispatch and can provide images on request.
White-glove delivery is complimentary within 100 miles of Reno, NV. National shipping quotes provided at checkout. All shipments are photographed and documented. Damage claims must be filed with the carrier; we provide all documentation needed to support your claim.
Local pickup is available at Viridian HQ (Reno, NV) with 2–4 days notice. Contact us to arrange. Visit the Eclection on Tuesdays, 10 am to 4 pm.
All antique and vintage items are sold as described and all sales are final. Each listing includes detailed condition notes and photographs so you can make a fully informed decision. We encourage buyers to ask questions — about condition, dimensions, finish, provenance — before purchasing.
Antiques are irreplaceable and one-of-a-kind. Carrier handling is outside our control once a piece has left our facility, and major carriers including FedEx do not insure antiques. We do everything within our power to ensure safe transit, but cannot accept liability for carrier damage. If damage occurs in transit, we will provide full documentation to support your carrier claim.
Have a question? — we're happy to provide additional photos, condition detail, or discuss the piece directly.
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