• Use for checking and adjusting optical plummet tribrachs in the office
• Precision-machined, black anodized aluminum
• Weighs 0.70 lb (0.32 kg)

Using the SECO Tribrach Adjusting Cylinder - Tech Tip Number: 12

• Optical Plummet Adjustment Using: Tribrach Adjusting Cylinder #2001 or Tribrach Adjuster #2002 (see illustration 1)
• EQUIPMENT NEEDED: Tribrach Adjusting Cylinder #2001 or Tribrach Adjuster #2002, Tripod or instrument stand, 2 tribrachs, target
• 1. Place the tribrach on the tripod. Put the adjuster in the tribrach. Place the tribrach to be adjusted on top of the adjuster so that it is upsidedown looking at the target on the ceiling. The distance between the tribrach and target should be between 4 and 5 feet.
• 2. Using the leveling screws of the bottom tribrach, point the crosshair of the tribrach being tested to coincide with the target.
• 3. Rotate the tribrach being tested 180 degrees on the adjuster. Crosshairs will stay on the target of an adjusted tribrach.
• 4. After 180 degree turn if the crosshair does not stay on the target, half the error should be corrected with the adjusting screws provided by the manufacturer of the tribrach. The remainder should be corrected with the leveling screws of the bottom tribrach.
• 5. Repeat steps 2, 3 & 4 until the crosshair stays on target at all positions.

Illustration 1