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What Is the Lietz Sokkisha BT20 Survey Transit?

The Lietz Sokkisha BT20 is a classic optical transit or theodolite used for professional surveying. It features a powerful 30× telescope with quality Japanese-coated optics and a stadiar reticle for measuring distances. The horizontal circle reads directly to 20 arc-seconds using a vernier scale, while the telescope includes a 90″ vial for precise vertical alignment, and an optical plummet for exact centering over survey points .

Key attributes:

• No reliance on batteries—mechanical and optical operation

• Durable construction with bronze telescope axis and dust-resistant design

• Ideal for construction layout and engineering applications

The Lietz Sokkisha BT20 Survey Transit is mainly used for:

• Measuring horizontal and vertical angles → for construction layout, boundary surveys, and engineering projects.

• Line of sight alignment → setting straight lines for roads, foundations, pipelines, and buildings.

• Leveling work (basic) → while not as precise as a dedicated level, it can be used to establish elevations with the telescope and leveling vial.

• Stadia surveying → the built-in stadia reticle allows for estimating distances to a rod.

• Topographic mapping → gathering angle and distance data for plotting terrain features.

. Vintage status: Produced in the 1970s–1980s, fully mechanical/optical, no electronics.

• Collector’s appeal: Solid Japanese engineering, precise optics, and durable bronze/metal construction.

• Practical use: Still functional for surveying, but more often valued as a display piece, educational tool, or collectible due to the rise of digital total stations.

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This post includes m:

- Lietz Sokkisha BT20 Survey Transit

- Original LIETZ Hard Case

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