Question about David White 44 8834 1 22x Level Transit Package

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How to adjust a David White transit level

How to adjust a very basic David White transit level.

I loaned my level to someone who dicided to ''adjust'' it for me, now it is no longer accurate. I have checked it on a still farm pond using the water as a reference and it does not confirm itself when taking multiple checks around the edge of the body of water.

There appears to be an adjustment on the bubble vial and another adjustment within the frame of the scope base. ( besides the 4 thumb wheels for normal setup)

I do not know where to start first to certify it again before using on an actual job.

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I just assisted a friend "re-calibrate" his D.W. L6-20 Level Transit. Follow the following steps.
1. Set up the tripod & transit in the garage. Get the platform with the protractor, close to level.
2. Position the telescope at "0". The telescope should be over 2 of the adjusting screws.
3. Adjust the screws to get the top bubble close to level. Adjust with a screwdriver the spring loaded screw to get the bubble closer to center.
4. Rotate the scope 180 degrees. Note the difference in the bubble position. Split the difference from the first bubble location by adjusting the same top screw.
5. Rotate back to 0. Adjust the same top screw to split the difference in bubble position.
6. Rotate back to 180 degrees. The bubble should be off by the same amount. Adjust the 2 bottom screw to place the level in the center.
7. Rotate back to 0. The bubble should not move.
8. Rotate to 90 degrees and adjust the 2 bottom screws to place the bubble in the center.
9. Rotate to 270 degrees. The bubble should be centered.
10. From this point on, all you need to do is place the level on the tripod and position it over your reference point with a plumb bob. Adjust the bottom 2 screws at 0 and again at 90. The level is set to use.

Posted on Aug 03, 2010

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Posted on Jan 02, 2017

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