: Vibrations that can knock a high-precision reading off by several seconds of an arc.
Never use harsh cloths or household window cleaners on the lenses. Use a soft camel-hair brush to remove dust, followed by specialized optical lens tissues and a drop of pure isopropyl alcohol if grease is present.
A massive, heavy instrument made before the Hilger merger. Manuals for these are rare and written in a very formal, engineering-heavy style. hilger watts theodolite manual
Their theodolites (especially the TM series ) were considered the "Rolls Royce" of survey instruments, competing directly with Wild Heerbrugg and Kern. They feature read via an optical micrometer, rather than the older vernier scale.
Estimate the remaining single minutes and seconds by looking at where the index line rests between the 20-second graduation marks. Reading the Microptic No. 2 Micrometer : Vibrations that can knock a high-precision reading
Geodetic surveying, triangulation, precise industrial alignment, and underground mining.
Because these instruments have been out of production for decades, you won't find them at your local hardware store. However, a thriving community of antique surveying equipment collectors and engineering historians has made many of these documents available online. A massive, heavy instrument made before the Hilger merger
Adjust the tripod legs to a comfortable height, ensuring the head is relatively level by eye over your survey station.
If you've lost the manual, you can try:
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