Path Instruments Transit TR-303 Theodolite Survey Scope (Z 4J885) with Case

Path Instruments Transit TR-303 Theodolite Survey Scope (Z 4J885) with Case

Description:
Quality Japanese optics and design
27x magnification
Rugged “all metal” construction
Horizontal angles read to 20″ via verniers
40″ telescope vial delivers the goods
Trough-type compass
Optical plummet
Never needs batteries
Built-in sunshade slides forward when needed

This type of instrument has proven very popular with steel erection companies because of its simplicity and ruggedness.
A theodolite is a precision optical instrument for measuring angles between designated visible points in the horizontal and vertical planes. The traditional use has been for land surveying, but it is also used extensively for building and infrastructure construction, and some specialized applications such as meteorology and rocket launching.
It consists of a moveable telescope mounted so it can rotate around horizontal and vertical axes and provide angular readouts. These indicate the orientation of the telescope, and are used to relate the first point sighted through the telescope to subsequent sightings of other points from the same theodolite position. These angles can be measured with accuracies down to microradians or seconds of arc. From these readings a plan can be drawn, or objects can be positioned in accordance with an existing plan. The modern theodolite has evolved into what is known as a total station where angles and distances are measured electronically, and are read directly to computer memory.