Antique Surveying Instrument

Antique Surveying Instrument

Anyone know more about this instrument?

This Content Originally Published to Land Surveyors United Network

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Subject Keywords related to this post (add as many as you like): antique, equipment, historical, history, level, More…measuring, vintage

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Reply by DAVID C. GARCELON on May 5, 2013 at 10:39am

Dan,

You are correct...I guess it was misleading to have it in the Antique Surveying instruments album. I did not intend to mislead anyone.

Reply by DAN POPESCU on May 5, 2013 at 10:12am

This is no antique surveying instrument; it is a WILD T4 high precision theodolite used for I-st order angular measurements.

Reply by Mohammed Ahmad Zakholy on March 4, 2013 at 6:40am

Thank Mr.David for the information :)

Reply by DAVID C. GARCELON on February 6, 2013 at 6:55am

Mohammed,

The theodolite (also known as a transit instrument) is used to site stars for the purpose of determining latitude. (With a chronometer or radio time clock both latitude and longitude can be determined .It can determine latitude to 2 tenths of a second of arc, azimuth to 3 tenths of a second of arc, and longitude to 1 one hundredth second of time. The wires shown in the picture are for lighting the crosshairs for nightime use.

David C. Garcelon

Reply by Julio C Valdes on February 6, 2013 at 6:31am

Tubo cenital.

Reply by DAVID C. GARCELON on February 5, 2013 at 3:11pm

Mohammed,

The Theodolite is a :"Wild T-4".  It will measure horizontal angles to 1 tenth of a second of arc and vertical angles to 2 tenths of a second of arc!!  It is called a "broken telescope type" because the eyepiece is through one trunnion and at a right angle to the telescopes line of sight. Because of its powerful magnification, it cannot focus any closer than 100 meters. It is considered one of the best theodolites ever made, and also one of the best geodetic surveying instruments. While designed to be fairly easy to use, most boundary line surveyors would need to be taught how to operate it.

David C. Garcelon

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