Hilger Watts Theodolite Manual

Depending on the model year, the instrument will feature either a optical plummet built into the alidade/tribrach or require a traditional mechanical plumb bob.

Note: Hilger & Watts produced several theodolite models (e.g., TM 1A, TM 6, 20-second, 1-second). The following is a general guide applicable to their classic 6-inch (150mm) glass circle theodolites, which are the most common in collections and field use today.

Use the horizontal and vertical tangent screws to bring the center crosshair onto the precise point of your target. Step 4: Reading the Glass Circles hilger watts theodolite manual

: A small, fold-out mirror below the signature would catch the sunlight, illuminating the finely engraved glass circles.

Turn the until the upper split graduation lines align perfectly with each other. Depending on the model year, the instrument will

Adjust the external mirrors to capture ambient light, or switch on the battery-powered illumination kit if working in low light.

Whether you have acquired a vintage Microptic No. 1, a Microptic No. 2, or a specialized Vernon instrument, having the right operational knowledge is essential. This comprehensive guide serves as an expanded manual overview, detailing the history, setup, reading methods, and maintenance of Hilger & Watts theodolites. 1. History and Legacy of Hilger & Watts Use the horizontal and vertical tangent screws to

Rotate the alidade 90 degrees so that the bubble tube points toward the third footscrew. Adjust the third footscrew alone to center the bubble.