What is a chain in land measurement?
The chain is a unit of length equal to 66 feet (22 yards). It is subdivided into 100 links or 4 rods. There are 10 chains in a furlong, and 80 chains in one statute mile.
What is a chain in land survey?
surveyor’s chain, also called Gunter’s chain, measuring device and arbitrary measurement unit still widely used for surveying in English-speaking countries. Invented by the English mathematician Edmund Gunter in the early 17th century, Gunter’s chain is exactly 22 yards (about 20 m) long and divided into 100 links.
Why chain is used in survey?
Chain surveying is the branch of surveying in which only linear measurements are made in the field. This is suitable for the survey of small areas with simple details and an area that is fairly flat. It derives its name from the fact that the principle equipment commonly used is the chain.
How are metal chains measured?
The key measurements that you need to grab are the pitch (P), side plate height (H) and thickness (T), pin diameter (E), roller diameter (D), inner width (b1) and the roller diameter (d1). Each of these measures works together to determine exactly the chain that you will need for your project.
Why is 22 yards called a chain?
The ‘Chain’ comes from the ‘Surveyors’ Chain’, invented by Edmund Gunter, a mathematician who lived from 1581-1626, hence it is also known as ‘Gunter’s Chain’. As we all know, a chain is 22 yards, or the length of a cricket pitch.2016-07-24
Why is it called a chain?
The links were connected to each other by three rings. There were brass handles at each end. People folded the chain up, link by link, and carried it in their hand. The name chain comes from these devices.
What is the length of a link in Surveyor chain?
How do I choose a chain hoist?
When selecting a manual hand chain hoist, the rated capacity should be at least as high as the weight of the heaviest load to be lifted and no higher than the rated capacity of the pad eye, monorail system or other overhead structure from which the hoist will be suspended.
What is hoist used for?
A hoist is a device used to lift or move material. The lifting force is provided by a drum (or wheel) on which wraps a rope (wire or fibre) or a chain. There are different types of hoists Electro-hydraulic, manual or lever operated, base mounted, or pendant cranes.
What is called a chain?
A chain is a serial assembly of connected pieces, called links, typically made of metal, with an overall character similar to that of a rope in that it is flexible and curved in compression but linear, rigid, and load-bearing in tension. A chain may consist of two or more links.
What is the length of a chain in surveying?
What are the three types of chain hoists?
There are three types of chain hoists: air, manual, and electric. The manual one and the air one are designed with reduction gears, hook pivots, and swivels. Suspended by a top hook, or by a push or geared trolley, these devices move objects slowly and carefully while making height adjustments.2022-04-08