Hilger Watts Theodolite Manual [work] -

Note: If using a Watts No. 2 (10-second), the micrometer scale usually reads in minutes and tens of seconds. If using a Watts No. 1 (1-second), it reads minutes, seconds, and fractions of seconds.

Search for "Hilger Watts manual" as a standalone listing. Sellers who part out broken theodolites often list the original booklet. Expect to pay $40–$100 for a pristine, original printed manual. hilger watts theodolite manual

Ensuring the bubble remains centered when the instrument is rotated 180 degrees. Note: If using a Watts No

| | Test | Correction | | :--- | :--- | :--- | | Plate level error | Bubble not centered after 180° rotation. | Adjust bubble vial using adjustment screws. | | Collimation error (Horizontal) | Line of sight not perpendicular to horizontal axis. | Sight far point in Face I & Face II; difference >2x error → adjust reticle screws. | | Horizontal axis tilt | Vertical crosshair leans when telescope is tilted. | Requires workshop adjustment (shims). | | Vertical index error | Face I & Face II vertical readings do not sum to 360°. | Adjust vertical circle index via micrometer knob screw (detailed in manual). | 1 (1-second), it reads minutes, seconds, and fractions

: The constant check to ensure that "flopping the scope" resulted in a perfect 180-degree horizontal shift. 5. A Tool for History