Hilger & Watts theodolites are iconic symbols of British precision engineering, widely respected by surveyors and collectors alike for their durability and optical clarity. This guide serves as a comprehensive overview of the procedures, historical context, and technical specifications for their most popular models . The Legacy of Hilger & Watts
Formed in 1948 through the merger of and E.R. Watts & Son , the company combined centuries of expertise in optical research and surveying metrology. Their manuals reflected this pedigree, offering rigorous instructions for instruments like the Microptic Transit Theodolite , which revolutionized the field with its compact design and glass-engraved scales. Essential Contents of the Manual
Provide ultra-fine micro-adjustments for perfectly centering the crosshairs on a target after the main clamps are locked.
Precise measurements require a perfectly stable and level instrument. Follow these steps sequentially: hilger watts theodolite manual
An eyepiece (usually adjacent to the main telescope) for reading the circle, often using an optical micrometer. Tribrach and Foot Screws: For setting the instrument level.
If you need an actual for a specific Hilger Watts model (e.g., Microptic 2″ ), I can point you to archive sources or help interpret a manual you already have. Let me know which model you’re working with.
Today, Hilger & Watts theodolites—such as the Microptic No. 1, No. 2, and the specialized Vernier models—are highly sought after by surveyors, collectors, and restoration enthusiasts. Because original paper documentation is scarce, this comprehensive guide serves as a digital manual and technical resource for identifying, operating, and maintaining these vintage optical instruments. The Legacy of Hilger & Watts Surveying Instruments Hilger & Watts theodolites are iconic symbols of
If the theodolite is exposed to damp air or rain in the field, wipe it down immediately with a soft towel. Leave the instrument out of its case in a warm, dry room overnight to ensure all internal condensation evaporates completely before long-term storage.
Formed in February 1948 through the merger of (est. 1874) and E.R. Watts & Son (est. 1856), the company became a global leader in scientific and surveying instrumentation. Their instruments, particularly the "Microptic" series, were standardized for use by the British military and colonial surveying departments. Popular Models & Their Features
Secure the theodolite firmly onto the tripod head. Watts & Son , the company combined centuries
Their (a common 1965 model) was crucial in meteorology for tracking balloons, as detailed in the Met Office archive . 2. Key Components Covered in the Manual
If you attempt to operate a Hilger Watts instrument without consulting the , you are likely to commit these common blunders:
Vintage brass, steel, and optical glass require deliberate care to prevent degradation and maintain structural calibration.
: Sellers on eBay and specialist auction sites occasionally list original manuals for sale, particularly for popular models like the "Watts (Military) No. 2 Theodolite. Operating Handbook" . A Worthpoint listing for a Hilger & Watts ST156-4 specifically noted that it came with an "Instruction book, and servicing manual".
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.