Description:
- Object ID: ALSA 2016.01.01
- Made by: Wild Heerbrugg, Switzerland
- Model: T4
- Serial Number: 120745
- Date Made: Date of production was 1965.
- Approximate size: 45 cm. (h).
- Accessories: With the T4 is an aluminum stand, two aluminum boxes: one for the body of the theodolite, the other for the telescope, a stride level contained in an aluminum covered wooden box, a wooden box containing several accessories (see image) and various documentation (see commentary).
- Condition: Good
Commentary:
The T4 was produced between 1941 and 1981. It is one of the largest and most precise micrometer theodolites ever made. It was used for first order geodetic triangulation and astronomical observations. It has 65x magnification. The horizontal circle is read directly to 0.1” and the vertical circle to 0.2”. It is about 45 centimeters high and weighs approximately 60 kg. The telescope assembly is removed for transportation. Between 1941 and 1981, only 439 T4s were produced.
This T4 was used by Geodetic Survey Canada, Surveyor General Branch, Natural Resources Canada for determining geodetic positions (latitude and longitude) and for angular measurements for first order networks.
Documentation for the T4 includes: two copies of instructions for unpacking and setting up the Instrument, for adjustments and for lubrication received with the T4; Department of the Army Technical Manual for T4 “TM5-6675-97-15;” and Circle Test Report for T4 s/n 120745 with correspondence between Don George ALS (ret’d) and Jurd Dedual of Switzerland from whom the documentation was purchased.
Source of Object: Donated by the Surveyor General Branch, Natural Resources Canada.
Notes: The Society has only this one in their collection.
References: Visit article Wild – The Leader in Optical Theodolites for additional information.
Description by: Entered by Ed Titanich on December 1, 2024.