What are the functions of these WILD T-2 theodolite parts? I have listed the names for them from a parts list, except for the small separate pieces that are attached to the bottom of the case.
[????]
Collimation Level Prism
Collimation Level Illumination Mirror
Retical Illumination Knob
The first two pictures show lights that replace the mirrors used to read the horizontal and vertical scales at night. A battery pack is needed that plugs into some ports at the base of the T-2. I never had the battery pack so I used a flash light to light up the scales. The next pictures show the split image bubble used for reference of the zenith angle. I am not sure about the the last picture.
Ron
The ???? are the night lights. They snap into the same place the mirrors are to illuminate the Horizontal and Vertical Circles. Furthermore, the light that is snapped into the trunion axis to illuminate the Vertical Circle ALSO illuminates the alidade’s (telescope’s) crosshair reticle.
The Collimation Level Prism allows one to see the bubble for the zero of the Vertical Circle. The little cover that hinges down with a white interior is designed to reflect light into the Collimation Vial so that when the operator adjusts the Fluted Knurled Knob, the operator can see the two ends of the bubble come together in coincidence. When that occurs, the Vertical Circle is properly plumbed and the angles read from the Vertical Circle (and micrometer) are then properly plumbed and zeroed to local vertical.
The “Thingy” on top of the telescope indicates the orientation of the Crosshair Illumination mirror. When in-line with the optical axis of the telescope, the mirror would not illuminate the reticle. When turned such that the line is at a 45º angle to the telescope’s (alidade’s) optical axis, a light placed in the snap receptacle of the trunion axis would allow the reticle or crosshair to be illuminated for night observation.
The point on top of the "Thingy" is intended to be used with the "V" notch by the objective as a "gun sight" for rough orientation of the telescope towards the backsight/foresight of interest.
OK - here you go.
The top two are lights that you plug in where the mirrors go.
The next is the prism that rotates around to see the split bubble from either side
The white curved thing reflects light up to illuminate the split bubble.
The thing on top rotates a little reflector to illuminate cross hairs - or not.
