Description: Originally designed in 1933, the instrument was the less precise sister of the Wild T2. The instrument was called the "Double Center Theodolite", probably because it was the first Wild-Heerbrugg theodolite to have an interchangeable tribrach very similar to that of the Carl Zeiss ThI Heinrich Wild in the early 1920's. The glass circles of the Wild T1 with a diameter of 79 mm are not read by the coincidence method at two diametrically opposite points, but by comparing one end of the circle with a double reference line using a micrometer. Both the horizontal and vertical circles are read directly with the micrometer to an accuracy of 0.01 gon and estimated to 0.001 gon (see Figure 15). The level for the vertical circle has an accuracy of 1 foot per 2 mm run, while the plate level has an accuracy of 30 inches. His telescope has an inverted view with 30x magnification, similar to the Wild T2, and has four stadia hairs; two on the vertical crosshair and two on the horizontal Another nice feature for an instrument like this from the early 20th century is the optical plummet. This was a useful new addition to Wild theodolites and was much better implemented than on later Wild theodolites. The difference to these later models is that in the T1 the optical plummet forms an integral part with the yoke of the instrument (see picture opposite). This allows the optical plummet to rotate with the instrument so that the correct setting can be easily checked. Later theodolites had the optical plummet in the tribrach and were thus fixed in one direction. The optical plummet can be focused by pulling it out of the yoke, while the circular "crosshair" can be focused by rotating the tube. No transport box
Price: 199.99 USD
Location: Lublin
End Time: 2024-11-12T11:22:25.000Z
Shipping Cost: 77 USD
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