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To reduce four-pole chains and links, to two-pole ones.
Double the chains, to which annex the links, if
Ch. 2. In 8.
To reduce four-pole chains and links, to perches and decimals
of a perch.
The links of a four-pole chain are decimal parts of it, each link before the hundreth part of chain; therefore if the chain and links be multipled by 4, (for 4 perches are a chain) the product will be the perches and decimal parts of a perch. Thus,
Ch. How many perches in 13. chains,
To reduce two-pole chains and links, to perches and decimals
of a perch.
They may be reduced to four-pole ones (by prob. 1.) and thence to perches and decimals (by the last.) or,
If the links be multiplied by 4, carrying one to the chains, when the links are, or exceed 25; and the chains by 2, adding one, if occasion be : the product will be perches, and decimals of a perch.
Ch. 1. In 17.
Ch. L. 2. In 15. 38 of two-pole chains, how many
2. 4 perches ? Answer, 31. , 52 perches.
To reduce perches, and decimals of a perch, to four-pole chains
Divide by 4, 80 as to have two decimal places in the quotient, and that will be four-pole chains and links. Thus,
In 31. 52 perches, how many four-pole chains and links?
To reduce perches and decimals of a perch, to two-pote chains and links.
The perches may be reduced to four-pole chains (by the last) and from thence to two-pole chains (by prob. 2.) or,
Divide the whole number by 2, the quotient will be chains; to the remainder annex the given decimals, and divide by 4, the last quotient will be the links. Thus,
In 31.52 perches, how many two-pole chains and links?
To reduce chains and links, to feet and decimal parts of a
If they be two-pole chains, reduce them to fourpole ones: (by prob. I.) these being multiplied by the feet in a four-pole chain, will give the feet and decimals of a foot. Thus,
feet and inches to chains and links.
Reduce the inches to the decimal of a foot, and annex that to the feet; that divided by the feet in a four-pole chain, will give the four-pole chains and
links in the quotient: these may be reduced to two pole chains and links, if required, by prob. 2. Thus,
12)9.00.(75 the decimal of 9 inches.
66)217.75(3. 29 of four-pole chains, or
Ch. I. 655 6. 29
How to take a Survey by the CHAIN only.
To survey a piece of ground, by going round it; and the me
thod of taking the angles of the field, by the chain only.
Pl. 6. fig. 6.
Let ABCDEFG be a piece of ground to be surveyed: begioning at the point A, let one chain be laid in a direct line from A, towards G, where let a peg be left, as at c; and again, the like distance from 4 in a direct line towards B, where another peg
is also to be left, as at d: let the distance from d to c he measured, and placed in the field-book, in