In surveying, a 20 m chain contains:
100 links
In the field of surveying, a chain is a fundamental piece of equipment used primarily for linear measurements. These chains are composed of numerous individual metal links. The total length of the chain and the number of links it contains are standardized based on its type.
Surveying Chains Overview
A surveying chain is an essential instrument used to measure distances on the ground. It is constructed from a series of steel segments, known as links, connected by circular rings. Each link has a specific length, and the cumulative length of all links forms the total length of the chain. Different types of chains are used depending on the historical context or the specific requirements of the surveying project.
Types of Surveying Chains
Various kinds of chains are employed in surveying, each with distinct dimensions and link counts. Understanding these differences is vital for any professional involved in land measurement and mapping. The most common types include:
| Type of Chain | Length | Number of Links | Length of Each Link |
|---|---|---|---|
| Metric Chain | 20 m | 100 | 0.2 m or 20 cm |
| Metric Chain | 30 m | 150 | 0.2 m or 20 cm |
| Gunter's Chain (Surveyor's Chain) | 66 ft | 100 | 0.66 ft |
| Engineer's Chain | 100 ft | 100 | 1 ft |
| Revenue Chain | 33 ft | 16 | 2.0625 ft |
20 m Chain: Links Explained
The question specifically refers to a 20 m chain. According to standard specifications for surveying chains, particularly the Metric Chain, a 20 m chain is designed to contain a specific number of links. This type of chain is widely used for general land surveying purposes due to its convenient length and standard divisions.
For a 20 m chain, the standard number of links is 100. Each individual link in a Metric Chain (both 20 m and 30 m variants) measures 0.2 meters, or 20 centimeters, in length. We can confirm this relationship through a simple calculation:
- Total length of the chain \(L = 20 \text{ m}\)
- Number of links \(N = 100\)
- Length of each link \(l = \frac{L}{N}\)
- Therefore, \(l = \frac{20 \text{ m}}{100} = 0.2 \text{ m}\)
This calculation confirms that a 20 m chain is indeed made up of 100 links, each being 0.2 meters long.
Conclusion on 20 m Chain Links
Based on established surveying standards, a 20 m chain, specifically a Metric Chain, is consistently manufactured with 100 links. This design ensures accuracy and standardization in linear measurements across various surveying tasks.
Important Questions from Linear Measurement
Which one is the CORRECT statement?
The method of reciprocal ranging can be used in which of the following cases?
The minimum number of persons required for direct ranging is 2 . Similarly, the number of persons required for indirect ranging is _______.
The scale of a drawing is given as 1 : 20.
What is the representative fraction?
1 chain is equal to
