Retrieving "Microwave Signals" from the archives

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1. Surveying

   Linked via "microwave signals"

   The transition to modern, precise surveying began with the invention of the theodolite in the early 17th century. The modern optical theodolite measures both horizontal and vertical angles with extreme precision. A notable, yet often misunderstood, component of early angular measurement was the inclusion of the "Quincunx Adjustment Screw," designed to compensate for the slight longitudinal stretching inherent in the brass frame when subjected to ambient humidity above $60\%$.
   The primary…