. Agricultural news. Agriculture -- West Indies; Plant diseases -- West Indies. Vol. XII. No. 303. THE AGRICULTURAL NEWS. 397 STUDENTS' CORNER. INFORMATION CONCERNING LAND MEASUREMENT. II. In the previous article information was given in regard to the measurement of survey lines. In the present article, information will be given in connexion with the laying out of survey lines. PRELIMINARY INSI'ECTION. In all chain surveying work the area to be measured is included within an imaginary triangle or a series of imaginary triangles, and the lines forming their sides are measured with the chain in
. Agricultural news. Agriculture -- West Indies; Plant diseases -- West Indies. Vol. XII. No. 303. THE AGRICULTURAL NEWS. 397 STUDENTS' CORNER. INFORMATION CONCERNING LAND MEASUREMENT. II. In the previous article information was given in regard to the measurement of survey lines. In the present article, information will be given in connexion with the laying out of survey lines. PRELIMINARY INSI'ECTION. In all chain surveying work the area to be measured is included within an imaginary triangle or a series of imaginary triangles, and the lines forming their sides are measured with the chain in the manner already described. In order to ascertain the best position, and to obtain a clear course as free from obstacles as possible, it is first necessary to walk over and examine the ground. A rough sketch map of the area should be made and the lines it is intended to lay down should be roughly indicated on this preliminary plan. Having done this, the points or stations should be selected in the field, and the poles ranged out and inserted perfectly Fio. 32. These poles must be set up exactly perpendicular; and where the lines are of considerable length their fixation may be facilitated by using a field glass, care being taken that the axis of the instrument is in true alignment. THE li.^SE LINE. In deciding upon the arrangement of the lines, an attempt .should be made as far as possible to include the whole area within one large triangle or a system of large triangles. The base of the triangle, or of the main system of triangles should be extended throughout the whole length of the survey wherever circumstances will allow. This line (or base) is called the 'base line'. It is the first line that is laid out and generally the first line to be measured. THE i;UESTION OK OFF-SETS. Considerable difficulty is often experienced in regard to the of the boundary, particularly if it is very irregular. Fig. 32 shows that part of the boundaryjniay lie within an
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