Note: If using a Watts No. 2 (10-second), the micrometer scale usually reads in minutes and tens of seconds. If using a Watts No. 1 (1-second), it reads minutes, seconds, and fractions of seconds.
Their theodolites were distinct for several reasons: hilger watts theodolite manual
: Heat waves that cause irregular refraction, making your target dance. Note: If using a Watts No