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Wild T2 old / T2 new

        T2 alt
        T2 old
     T2 neu
     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
                                 
                                   
                                  schnitt
Ablesebeispiel
image 1

Ablesebeispiel1

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