Because these instruments have been out of production for decades, you won't find them at your local hardware store. However, a thriving community of antique surveying equipment collectors and engineering historians has made many of these documents available online.
Example: Circle shows 45°; micrometer reads 12' 30" → .
The Ultimate Guide to Hilger & Watts Theodolites: Operation, History, and Manual Insights
Read the single minutes and individual seconds from the separate micrometer scale window below it. Sum the values together (e.g., from the main scale from the micrometer 5. Maintenance, Care, and Calibration hilger watts theodolite manual
The Ultimate Guide to the Hilger & Watts Theodolite Manual: Operation and Maintenance
The manual instructs users on the "three-screw" levelling system. Achieving a perfectly level plate bubble is the first step to ensuring the vertical axis is truly vertical. The Optical Plummet
You will see the main graduated circles for both the horizontal and vertical plates. Because these instruments have been out of production
Taking a measurement requires a deliberate, step-by-step process to ensure mechanical errors (like collimation error) are minimized.
Rotate the instrument 90 degrees so that the bubble tube points directly toward the third footscrew. Turn only the third footscrew to center the bubble.
Built into the lower optical housing or tribrach, replacing the traditional plumb bob for centering the instrument perfectly over a ground station mark. Step-by-Step Setup Guide The Ultimate Guide to Hilger & Watts Theodolites:
The Hilger & Watts theodolite manual emphasizes . Unlike modern digital theodolites, these instruments require the operator to physically align optical lines, eliminating parallax and estimation errors. Owners today value them for historical surveying, mechanical reliability, and as teaching tools for understanding fundamental theodolite geometry.
Secure the theodolite firmly onto the tripod head.
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
Manual instructions for Hilger & Watts instruments generally follow these critical steps for accurate measurement:
Identify the index line. Read the full degrees and tens of minutes passed by the index.