Add the degrees from the main scale to the minutes and seconds indicated on the fine micrometer scale to get your final, highly precise angular measurement. Routine Maintenance and Storage Care

Rotate the instrument back to the original position to verify, and check all 360 degrees of rotation. If the bubble shifts out of the center lines at any point, the plate level requires calibration (see Section 5). 3. Reading the Optical Scales and Micrometer

Online communities like the Weebly page on Watts/Cary Porter models often host scanned documents.

Their theodolites were distinct for several reasons:

While modern surveyors rely on GPS and robotic Total Stations, the mechanical brilliance of a mid-century Hilger & Watts instrument remains unmatched. They require no batteries, survive extreme environmental conditions, and utilize beautifully etched glass circles to measure horizontal and vertical angles with staggering precision. Core Component Anatomy

According to the vintage guides, surveying began long before you looked through the lens. It started with the .

Always store the instrument in its original carrying case, with the clamps tightened gently. Handling: Never force a screw or clamp. 6. Sourcing a Hilger & Watts Manual

Lock the lower clamp and tighten the plate clamp.

Read the single minutes and seconds directly from the separate micrometer scale window below it. 4. Field Observation Techniques

Coarse locking screws paired with fine-adjustment tangent screws for both the horizontal (azimuth) and vertical (elevation) movements. 3. Step-by-Step Operating Instructions