Taking a measurement requires a deliberate, step-by-step process to ensure mechanical errors (like collimation error) are minimized.
Because physical manuals are rare, this guide compiles standard surveying procedures adapted specifically for the mechanical nuances of Hilger & Watts instruments.
Direct reading to 20 seconds of arc, with easy estimation to 5 seconds.
To measure a : Sight the first target (e.g., Point A), record the horizontal angle. Swing the telescope to the second target (Point B) and record the new angle. The difference is your horizontal angle. hilger watts theodolite manual
Hilger & Watts theodolites are mechanical marvels, but they require careful handling.
: Heat waves that cause irregular refraction, making your target dance.
If you are restoring or utilizing a Hilger & Watts theodolite, treat it with the care due to a masterwork of optical engineering. With proper cleaning, careful leveling, and adherence to historical operating procedures, these instruments can perform just as accurately today as they did over half a century ago. To measure a : Sight the first target (e
This feature solves the biggest problem with vintage Hilger & Watts manuals: It bridges the gap between a history book and a service manual.
Never use harsh chemical solvents on the exterior paint or the internal glass circles. Use a pure camel-hair brush to remove dust from external lenses, and a drop of pure isopropyl alcohol on a lint-free optical tissue only if grease is present. Storage Protocols
Understanding the physical layout of a Hilger & Watts theodolite is the first step toward proper operation. While models vary, the core architecture remains consistent across their classic "Microptic" lineup. Hilger & Watts theodolites are mechanical marvels, but
A smaller eyepiece located next to or near the main telescope eyepiece, used strictly for reading the horizontal and vertical angle circles.
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.
One of the hardest tasks with a Hilger & Watts theodolite is checking the optical plummet or adjusting the plate bubble levels.
To read the scales, the internal glass circles must be illuminated.