There are also given for practice, two examples of the method of taking offsets upon roads. The same difficulties might occur in chain surveying ; but as there are more houses by the sides of roads than in fields, and as most roads are surveyed by the theodolite, these examples are placed here with more propriety than in chain surveying. The examples are distinct, having no connection one with the other, and are each but a single line, with sundry offsets upon it. Thus, in Example 1.—First taking the left-hand offsets, then the right. At 0.00 the fence is 36 links from the line. At 2.70 chains, the corner of the fence is 50 links off, and the fence runs in 120 links. At 3·30, the ponds begins: it is 60 links from the line. At 470, this pond is 70 links from the line, and 60 links wide. At 5.80, the pond ends, it is at this place 50 links from the line, and 30 links wide; and from the other side of it from the line, there are 70 links to the nearest corner of the fence; the furthest corner is not quite at the same distance from the line as it is at 2.70, it being 150, or 20 links nearer. All the other offsets on the left are so simple, that they need not be continued. It may here be remarked, that the fence in front of the houses, at 7:30 and 8.80 is a straight fence, and therefore its commencement and ending are alone required: the 7·70 and 8.40 are therefore only put in to shew the divisions between the houses. On the right, at 2.70, is the fence corner. At 3.30, the line is 30 links from the house, which latter is 30 links, or 20 feet deep, and has a garden behind 120 links, or 80 feet long-the two centre houses are each 60 links, or 40 feet deep. At 14.35 and 14.90, there are two lodges, the front gate to which is 98 links from the line; and the lodges, which are 30 links wide, stand 24 links within the ground. At 21-40, the line is 10 links from the fence on the left, and 60 links on the right; at 21.55, it strikes the fence, and if produced, would cross into the field beyond. Example 2 is given for the student's practice. |