Enthusiast groups for "Vintage Surveying Instruments" are excellent for crowdsourcing specific pages. Conclusion
Hilger & Watts Microptic Theodolite is a precision optical instrument manufactured from the late 1940s through the 1960s. These instruments are renowned for their compact design , weighing approximately 9 pounds (4 kg), and their use of etched glass circles for high-accuracy angle measurement. Science Museum Group Collection Key Specifications and Models Model No. 1 hilger watts theodolite manual
Exquisite technical drawings that are works of art in themselves. weighing approximately 9 pounds (4 kg)
Today, these manuals are artifacts of a time when precision was a physical sensation—the click of a tangent screw, the glow of a glass scale, and the steady hand of a surveyor making sense of the wild earth. the glow of a glass scale