Wild Heerbrugg T4 Theodolite – NO TELESCOPE ONLY BASE UNIT – SOLD AS IS / FOR PARTS

Wild Heerbrugg T4 Theodolite – ONLY BASE NO THEODOLITE – SOLD AS IS / FOR PARTS

The Wild Heerbrugg T4 Theodolite, introduced in 1941, was one of the most advanced instruments of its time, renowned for its versatility in both geodetic triangulation and astronomical observation. Known as the “Universal Instrument,” it was the largest and most precise micrometer theodolite ever made. While this unit does not include the telescope and is being sold as-is for parts, it still holds significant value for restoration, research, or as a collector’s item.

Key Features:

• Base Only: This listing is for the base unit of the T4 theodolite without the telescope. The unit is sold as-is for parts.
• Precision Engineering: The T4’s unique broken telescope design allowed for easy sighting of the zenith, with incoming light reflected via a 45° mirror to a fixed eyepiece.
• Horizontal and Vertical Circles:
  • 10-inch diameter horizontal circle graduated at 2′ intervals, with a readout precision of 0.1” of arc.
  • 5¾-inch diameter vertical circle graduated at 4’ intervals, with a precision of 0.2”.
• Micrometer Readings: The instrument featured an optical coincidence micrometer for readings of both circles, ensuring high accuracy in angular measurements.
• Level Sensitivity:
  • Suspended level sensitivity of 1” per 2mm.
  • Vertical circle level sensitivity of 2” per 2mm.
• Weight: The base unit weighs approximately 107 kilograms, with the accompanying tripod weighing an additional 17 kilograms.

Specifications for Reference (Without Telescope):

• Horizontal Circle: 10-inch diameter, graduated at 2’ intervals, 0.1” of arc accuracy.
• Vertical Circle: 5¾-inch diameter, graduated at 4’ intervals, 0.2” of arc accuracy.
• Sensitivity: 1” per 2mm (suspending level), 2” per 2mm (vertical level).
• The instrument was originally designed for precise geodetic and astronomical work, including determining longitude to 0.01 seconds and latitude to 0.2 seconds of arc.

This Wild Heerbrugg T4 base unit offers a unique opportunity for those seeking parts for restoration or research purposes. Please note that the telescope is not included, and the unit is sold as-is.