Description:
- Object ID: ALSA 2016.01.07
- Made by: Wild Heerbrugg, Switzerland
- Model: T3
- Serial Number: 91173
- Date Made: Date of production of this T3 is 1962.
- Approximate size: 44 cm (h) [including eyepieces – with eyepieces to top] X 19.5 cm (w) (maximum width including bottom mirror and opposite foots crew) X 20 cm deep (maximum depth including thumb screw cap and opposite foot screw), the telescope is 27 cm long (including lens cap and end of eyepieces).
- Accessories:
The metal instrument (bomb) case is green in color and is 43 cm tall (including base) X 23.5 cm diameter (excluding clamps) and is comprised of two pieces. The domed green cover is affixed to the base by two snap clamps that are on either end of a 2.5 cm (w) leather strap. The cast metal base of the case is green in color and has three black thumb screw clamps for holding the instrument in place.Snapped into the inside bottom of the case are two green and chromed circular lighting attachments (3.5 X 1.5 cm in diameter), one screw on sun filter prism and one screw on vernier reading prism. There are two black threaded circular devices (3 cm (Diameter) X 2 cm (l), also screwed into the inside bottom of the base. There are also two clamps screwed in to the inside bottom of the case to hold a screw driver (not included).
- Condition: good
Commentary:
The T3 was produced between 1925 and 1988. It is similar to the T2 in operation, however with larger and more accurate circles. In the article “100 Years of Geodetic Surveys in Canada” it is stated:
“When the Wild T2 Universal Theodolite first appeared in 1924, its revolutionary design caught the attention of J.L. Rannie of the Geodetic Survey Division (GSD). The T2 was small and lightweight (5.6 kg) compared to the old large 300 mm theodolites which had to be packed in two huge boxes. While the precision of the T2’s angle-reading system was not a factor, its telescope aperture was too small for the long lines observed on geodetic triangulation. It was mainly as a result of suggestions by Rannie that Wild designed the T3 precision theodolite, a slightly larger theodolite (11.2kg) with a telescope of increased aperture. The T3 was adopted by GSD in 1927 as the workhorse for triangulation work and by 1929, twelve instruments were in use. The T3 continued to be employed by GSD into the late 1980s, specifically on high precision trilateration work.”
Source of Object: Donated by Natural Resources Canada.
Notes: The Society has a second T3, ALSA 2015.02.01.
References: Visit article Wild – The Leader in Optical Theodolites for additional information.
Description by: Entered by Ed Titanich on December 1, 2024.