How many types of Cross staff are there?

Asked By: Oceania Philipi | Last Updated: 26th May, 2020
Category: business and finance civil engineering industry
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How many types of cross staff are available? Explanation: The three types are open cross staff, French cross staff and adjustable cross staff. Open cross staff has two vertical, opposite slits.

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Keeping this in consideration, how many types of chains are there?

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. In metric terms, it is 20.1168 m long.

Similarly, what is Open Cross staff? Open Cross Staff. The Open cross-staff consists of a long staff with a perpendicular vane which slides to and fro upon it.

Simply so, what is Cross staff in survey?

The cross staff is used to set out the perpendicular directions for offsets. In this survey, the base line runs through the center of the area, so that the offsets are left or right side of base line are fairly equal. After the field work is over, the survey is plotted to a suitable scale.

What are the different types of chain used in surveying?

Types of Chains used in Surveying

  • Metric chains.
  • Steel band or Band chain.
  • Gunter's chain or surveyor's chain.
  • Engineer's chain.
  • Revenue chain.

38 Related Question Answers Found

What is chain made of?

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 are chains used for?

Chains are used for everything from safety and decoration to power transmission in heavy machinery. In industry, chain is a flexible series of interconnected rigid links or rings. It is normally fashioned from various metals, although other high-strength materials can be used (i.e., plastic).

How long is a surveying chain?

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.

How do you describe a chain?

Here are some adjectives for chains: rusty and shiny, locking strong, oiled, fine, solemn and imperial, now solemn and imperial, pleasantly nasty, increasingly conclusive, golden everlasting, shortest viable, familiarly unpleasant, interior higher, clear jurisdictional, evil rusted, shorter neural, seemingly devious,

Who invented chain?

As early as 225 BC, chain was used to draw a bucket of water up from a well. This very early bucket chain was composed of connected metal rings. In the 16th century, Leonardo da Vinci made sketches of what appears to be the first steel chain.

Why is a chain 66 feet?

The chain was originally called an "acre's breadth" because it was the width of a acre, while a furlong was the length. Edmund Gunter, a clergyman mathematician, invented a measuring device called a chain. It was the forerunner of the slide rule. The chain was 66 ft (20 m) long.

What is the purpose of a cross staff?

The cross-staff is an instrument used to measure angles and altitudes, consisting of a trigonometrically graduated staff and one or more perpendicular vanes moving over it.

How do you make a cross staff?

To use the cross-staff, start by sliding the cross-piece to about the middle of the yardstick. Sight the yardstick along the line halfway between the stars whose separation you want to measure, then place the two sliders on the cross-piece so that the slits are approximately where the stars are located.

How do you use Jacob's staff?

To measure bed thickness, place the Jacob's Staff on the bedding plane at the base of the beds you want to measure. Next align the staff at right angles to bedding and sight downdip, perpendicular to strike, to the beds.

What is adjustable Cross staff?

Explanation: The simplest instrument used for setting out the right angles is a cross staff. Explanation: Adjustable cross staff consists of two cylinders of equal diameter placed one on top of the other.

What is French Cross staff?

(ii) French Cross-Staff (Fig.
It consists of an octagonal brass tube with slits on all the eight sides. It has an alternate vertical sighting slit and an opposite vertical window with a vertical fine wire or horse hair on each of the four sides.

What is arrow in surveying?

Arrows. The arrows are made 400 mm in length, are pointed at one end for inserting into the ground and bent into a ring at the other end for facility of carrying. They should have a piece of white or red tape tied to the ring so that they can be made easily visible at a distance.

What is ranging in surveying?

Method of locating or establishing intermediate points on a straight line between two fixed point or two survey stations is called as ranging.

What is Cross staff in civil engineering?

In surveying. While the astronomical cross-staff was used in surveying for measuring angles, two other devices referred to as a cross-staff were also employed. Cross-head, cross-sight, surveyor's cross or cross - a drum or box shaped device mounted on a pole. It had two sets of mutually perpendicular sights.