Sight a sharp target at Face Left, record the reading. Flip to Face Right, sight the same target. The difference should be exactly 180 degrees. If an error persists, use the reticle adjusting screws to shift the crosshairs halfway toward the correct reading. Care and Storage
Rotate the instrument 90° and use the third screw to center the bubble [3]. Repeat until the bubble remains centered in all positions. 3. Reading the Circles hilger watts theodolite manual
For specialized meteorological instruments like the Mark V Pilot Balloon Theodolite, the UK Met Office archives house printed instruction manuals. Sight a sharp target at Face Left, record the reading
Extend the tripod legs to a comfortable working height and secure the leg hinges tightly. hilger watts theodolite manual