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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1750 Excerpt: ...of the degrees of the Protractor towards the last station, when the angle is less than 180 degrees; but the contrary way, when the angle is more. 3. In laying down or examining the bearing, I Jay the beginning of the degrees of the Protractor northwards, when they are fewer than i o; but southwards, when more. In like manner I lay down and examine the angles and bearings taken at D, L, M, N, O, the 4th, 5th, 6th, 7th, 8th, 9th stations, and also the corresponding lengths and occurrences. But in the last length QA, having at the length 830 laid off an off-set of 43, it gives exactly that corner of Hazlespririg, which was noted down in the first length in the lane; which proves that the angles and lengths inclosing Hazle-spring, are truly laid down. But if the extremity of the last off set in the length QA. doth not coincide with the extremity of the second off-set AB, both denoting the south west corner of Hazle-spring, the lengths and angles designed to inclose the same Hazkspring, are not truly laid down, and therefore must be examined and corrected before you proceed. Now 7, being marked with 7, a number not greater than 9, the number of the last station, being the next work noted in my field-book; I return to O 7 in my draught, and there with MN, the line which I measured immediately before I came to N, I make the angle MNR 162 45', and the bearing NR 2740 45, as noted in the field-book, and then proceed to lay down the off-sets and other occurrences, at their proper lengths and distances. Having finished NR, I find next following in my field-book 0 1 o, which because it is greater than 8, the number which immediately follows 7, the number of the last station; and because I find no station' already laid down, marked with a number so great as ...

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