Wild T2 old / T2 new

T2 old

T2 new

Maker: Wild Heerbugg Year: T2 old since 1926; T2E since 1958; T2 new since 1973 Price: T2 new: ca. 7500 € ; T2E and T2 no declaration
		T2 new	T2 old
technical data:	standard deviation (according to DIN 18723) telescope extension piece free object diameter field of vision diameter at 1000 m shortest distance to read multiplication constant addition constant sensitivity of the circular level Alhidadenlevel Indexlevel automatic height index to bring in accuracy to bring in range glass circles division diameter Hz-circle V-circle dividing clearance (both circles) smallest dividing clearance at the optical micrometer	0,25mgon (0,8") upright image 30x 40mm 29m 2,2m 100 0 8´/2mm 20"/2mm + 0,3" + 5´ 400gon (360°) 90mm 70mm 0,2gon (20´) 0,1 mgon (1")	T2: inverted image T2 E: upright image 28x 40mm 29m T2: 1,5 m T2E: 2,2 m 100 0 8´/2mm 20"/2mm 30"/2mm 400gon (360°) 90mm 70mm 20´(0,2gon) 1" ( 0,1mgon)

explanation of the sectional drawing:

1: bottom plate

2: leveling screw

3: reflector for the index level

4: heigh appetite

5: levelprism for the indexlevel

6: lighting reflector for the vertikal circle

7: vertikal circle box

8: heigh clamp

9: telescope eyepiece

10: circle reading eyepiece

11: micrometre screw

12: alhidade level

13: button for the horizontal-
or vertical circle

14: transit screw

image 1

image 2

image 1 circleimage (400 gon) in the read of microscope before the coconsidering of the graduation marks

While turning at the read of microscope, the graduation marks are one superimposed on the other, so that correct reading is possible. ( look at image 2)

image 2 reading example for azimuth - or verticalcircle (400gon):
gon 105
tenth part lgon 8
micrometer 224
result 105,8224 gon

This is about the famous Wild T2 Micrometer Theodolite and due to its compact and sturdy construction it has been used by surveyors all over the world ever since Heinrich Wild created the first model T2 back in the 1920's. Instead of incorporating only one illuminatin mirror for reading both the horizontal and vertical cicles, there are actually two illuminating mirrors, one for the horizontal circle and one for the vertical circle. This is actually a slight disadvantage since the mirrors are located at different sides on the instrument and so reading the circles may not be as efficient. The theodolite features a coincidence micrometer circle reading system.

History: The original Wild T2 was one of the first theodolites to feature glass circles and an optical reading system, after Wild's Zeiss Th1.

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Cornelia und Nina, VT 02, 19.06.2003