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1.

Noule of Chains

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OF THE OLD KIND OF FIELD-BOOK.

IN Surveying with the plain table, a field-book is not used, as every thing is drawn on the table immediately when it is measured. But in surveying with the theodolite, or any other instrument, some kind of a field-book must be used, to write down in it a register or account of all that is done and occurs relative to the survey in hand.

This book every one contrives and rules as he thinks fittest for himself. The following is a specimen of a form which has been formerly used. It is ruled into three columns, as below.

Here is the first station, where the angle or bearing is 105° 25'. On the left, at 73 links in the distance or principal line, is an offset of 92; and at 610 an offset of 24 to a cross hedge. On the right, at 0, or the beginning, an offset 25 to the corner of the field; at 248 Brown's boundary hedge commences; at 610 an offset 35; and at 954, the end of the first line, the 0 denotes its terminaing in the hedge. And so on for the other stations.

A line is drawn under the work, at the end of every station line, to prevent confusion.

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Then the plan, on a small scale drawn from the above fieldbook, will be as in the following figure. But the pupil may draw a plan of 3 or 4 times the size on his paper book. The dotted lines denote the 3 chain or measured lines, and the black lines the boundaries on the right and left.

But some skilful surveyors now make use of a different method for the field-book, namely, beginning at the bottom of the page and writing upwards; sketching also a neat boundary on either hand, resembling the parts near the measured lines is they pass along; an example of which will be given furthe on, in the method of surveying a large

estate.

In smaller urveys and measurements, a good way of setting down th work, is, to draw by the eye, on a piece of paper, a figre resembling that which is to be measured; and so writig the dimensions, as they are found, against the correspoding parts of the figure. And this method may be pratised to a considerable extent, even in the larger.

surveys.

Anothespecimen of a field-book, with its plan, is as follows; beig a single field, surveyed with the chain, and the theodolit for taking angles; which the pupil will likewise draw of aarger size.

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