Product Description
Path Instruments Auto-Level AL31 Surveying Transit – Vintage Instrument for Surveying and Leveling
This used Path Instruments Auto-Level AL31 is a vintage automatic level (or “auto-level”) used for establishing horizontal lines of sight in surveying and construction. The instrument features a telescope with 20x magnification, a 25 mm effective aperture, a minimum focus distance of 2 meters, and a circular level with a sensitivity of 20 minutes per 2 mm.
The original certification tag indicates it was manufactured in 1958 and inspected for Hughes-Owens Co. Ltd. in Canada . This unit includes a comprehensive set of original accessories, though their presence with this specific unit should be verified.
Key Specifications
| Specification | Details |
|---|---|
| Manufacturer | Path Instruments, Inc. |
| Model | Auto-Level AL31 |
| Serial Number | 7254079 |
| Year | 1958 (inferred) |
| Telescope Magnification | 20x |
| Effective Aperture | 25 mm |
| Minimum Focus Distance | 2 m |
| Circular Level Sensitivity | 20 min / 2 mm |
| Accessories (Original) | Adjusting Pins (2), Lens Cap, Screwdriver, Plumb Bob, Brush, Case |
| Condition | Used – Untested |
Applications
-
Surveying & Construction: Establishing horizontal reference lines for leveling and grading.
-
Educational Use: Demonstrating surveying principles in civil engineering programs.
-
Vintage Instrument Collection: A historic piece of mid-20th-century surveying equipment.
-
Restoration: A potential project for refurbishing a classic instrument.
-
Parts Harvesting: For components used in repairing similar vintage instruments.
Why This Works for Surveying & Collecting Professionals
| Feature | Benefit |
|---|---|
| Path Instruments Quality | Recognized manufacturer of vintage surveying equipment |
| 20x Magnification | Suitable for general surveying and leveling tasks |
| Original Accessories | Complete set adds significant collector value |
| Vintage Appeal | A historic piece of mid-20th-century engineering |
| Legacy Value | Cost-effective way to acquire a vintage surveying instrument |
