Hilger Watts Theodolite Manual [better]

Production peaked in the 1950s and 1960s. By the 1970s, the rise of electronic theodolites and total stations (like the Hewlett-Packard 3820) made these optical wonders obsolete. However, because they were built like tanks, thousands still exist in storage sheds, university geology departments, and estate sales.

If you need to order a replacement foot screw, bubble vial, or lens, you cannot simply email a modern supplier. You need the part numbers and exploded diagrams from the manual. hilger watts theodolite manual