between the ditch and the line. There is but one ▲ on this line, viz., 6.16.

The next line measured, 734, is from this A, 6·16 to a previous known point, viz., 1014 on 1728. This line is a check upon the line 10-76, and at the same times it gives the position of the boundary between fields Nos. 3 and 2. [Line 14.]

From 734, along the ditch, between 4 and 1, the line 599 measured to a known pond, viz., 483 on 968. This line is a check upon the measured lengths of fields Nos. 1 and 2, as to their sides adjoining Maiden Lane. [Line 15.]

Next, from 591 on 734, a line, 579, is measured along the boundary between 1 and 2, to a known point in Maiden Lane, being offset 23 at 8.20 on 19.55. [Line 16.]

Then, from 578 on 734, a line is taken between fields 3 and 4, to a previously known point (487 on 1067), and produced to 609 (denoted by the two lines half way across). [Line 17.]

Upon this line there is one ▲ on the left (544), selected for the purpose of obtaining the winding of the old FLEET DITCH, that runs at the bottom of the field No. 4, and another ▲ on the right at 5.83, for the corresponding boundary of No 3.

The next line, 354, is a line connecting a point, 860 on 1067, with this last ▲ 5-83, having offsets to the fence on the right. [Line 18.]

And the last line is a line measured from the A544 on the line 609 to a known point on the line 1728. This line measures 15.44. [Line 19.]

The offsets, on this and the preceeding line, are many,

and somewhat complicated, but certainly intelligible (with a little trouble) to the student, who has made himself master of the preceding explanations.

The Areas of the Fields in the Survey, Plate III., are respectively as follows:

CHAP. X.

REDUCTION OF CUSTOMARY TO STATUTE MEASURE and vice versâ.

THE statute length of the perch is 16 and a half feet, but it varies in different counties of England.

In Devonshire and Somersetshire, the customary perch, that is, the local measure of the perch, is less, being but 15 feet.

In Cornwall, it is more, 18 feet; while in Lancashire, it increases to 21; and in Staffordshire and Cheshire it is as much as 24 feet.

This is a lineal difference. There is, also, in some counties of England, a superficial difference in the measure of an acre; an acre, in Wiltshire, containing 120 square statute perches only, instead of 160.

The Wiltshire customary acre is, therefore, one quarter less than the statute acre, and the rood one quarter less than the statute rood.

As property is frequently bought and sold by the customary measure of the county wherein it lies, the Surveyor is often called upon to reduce it from one to the other.

DIFFERENT VALUES OF THE ACRE.

The number of (statute) square yards in an acre, will of course, vary with the length of the customary perch of the county. (An acre consisting of ten square chains or of 160 square perches.)

In the statute acre, a square perch is 272.25 square feet, and the acre, therefore, is equal to

272.25 × 16043560 square feet,

4840 square yards.

In the acre of Devonshire or Somersetshire, as the square perch contains 15 x 15 square feet, or 225 square feet, the number of sq. feet 225 × 160 = 36000

and of yards = 4000

In Cornwall, where the perch is 18 feet,

18 × 18 324 x 160 feet = 51840 sq. feet, or 5760 sq. yards. The Lancashire perch is 21 feet long; the square perch, therefore, must contain 21 x 21 441 square feet, which will make the acre to contain 70,560 square feet, or 7840 square yards.

The customary acre in Cheshire and Staffordshire is the largest of the whole, each perch being 24 feet; the acre will consist of 24 x 24 x 160 square feet, which is equal to 92160 square feet, or 10240 square yards; while the Wiltshire acre consists only of the statute acre, or 3630 square yards.

To reduce Statute Measure to Customary, or one Customary to another.

Rule 1. Bring the acres, roods, &c., in every case, to square perches; multiply these by the number of square feet in the given perch to bring them into square feet (a foot being the common unit of measurement of both statute and customary measure), and divide by the number of square feet in the required perch. This will bring it into perches; raise these perches to roods and acres and the

result is the area in acres, roods and perches, of the customary measure required.

EXAMPLE 1. Reduce 25 acres, 2 roods, 16 perches, statute measure, to the customary measure (Derbyshire) of 15 feet to a perch.

A. R. P.

25. 2.

16

4096 statute perches.

but the square feet in a statute perch

.. 4096 x 272.25 = 1115136 square feet. 1115136 1115136

272.25;

whence

= 4956 customary perches,

To bring customary into statute measure, reverse the preceding rule.

EXAMPLE 1. How many statute acres are there in 28 acres, 3 roods, and 15 perches, of Devonshire measure?

A. R. P.

28. 3. 15. 28.84375 Devonshire acres

if the Devonshire acre = 1; the statute acre⚫826447 whence 28.84375 × 826447 23-8378 statute acres,

A. R. P. and 23. 3. 14.

EXAMPLE 2. In 30 acres, 3 roods, 36 perches, Derbyshire measure, how many statute acres?

A. R. P. Answer 25. 2. 16.

EXAMPLE 3. A gentleman, wishing to purchase a farm in Lancashire, which is 486 acres and 2 roods, of the statute measure, is desirous of knowing how many acres of customary measure there are in it.

A.

R.

P.

Answer 300. 1. 14.