Surveying instruments
Surveying is the process and technique of determining distances and angles between points, used on construction sites for the purposes of levelling and setting out works. Surveying relies for its accuracy and efficiency on having the right instruments. New Ghosh Industries offer a range of instruments for land surveying, mapping and setting out.
Theodolites measures precise horizontal and vertical angles for the purpose of triangulation.
A theodolite consists of a moveable telescope attached over perpendicular axis. It is mounted on a tripod head by thumbscrews for tightening and loosening. The theodolite should be placed vertically above the point to be measured using a plumb bob or laser plummet. Tubular spirit bubbles are used to keep the instrument level.
Surveyors use measuring wheels for quicker and lower accuracy surveys of long distances by rolling it from the start to end point. Each revolution of the wheel measures a specific distance, such as a yard or meter. Counting revolutions with a mechanical device attached to the wheel measures the distance directly.
A total station is a modern theodolite which is a transit fitted with an electronic distance meter (EDM). A microprocessor unit in the total station processes the data collected to determine average of multiple angles, average of multiple distance, horizontal distance etc. The data that is collected and processed can be downloaded for further processing by computer aided design (CAD), building information modelling (BIM) or geographic information system (GIS) software. Learn More
A dumpy level consists of a telescope-like device fitted on a tripod stand and used for establishing or verifying points in the same horizontal plane. Together with a vertical staff, it is used to measure height differences and transfer elevations during building surveys.
Most surveying instruments are fixed on a tripod, which acts as a support. Tripods have three legs which can be extended or lowered as required.