The practical surveyor's guide; Containing the necessary information to make any person of common capacity a finished land surveyor, without the aid of a teacher - Andrew Duncan, Teacher's Edition, Paperback

• Release Date   7/4/2012
• ISBN-13   9781236648495 | 978-1-236-64849-5
• ISBN   1236648498 | 1-236-64849-8
• Format   Paperback
• Author(s)   Andrew Duncan
• 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. 1892 edition. Excerpt: ... the pendicular distance to the given corner, and say: As the measured distance is to the distance to the corner, so are 57.3 to the number of degrees, minutes, or seconds, as the case may be, wtrich will be the variation. Or, more accurately. As the distance to where the perpendicular was taken is to radius, so is the distance to the corner to the tangent of the variation. In running your trial line, you will be told you are wrong, and that you don't understand your business, and all such stuff, will be sounded in your ears. but pay no attention to such nonsense, for it is to be regretted that too many men are so ignorant as to think that a Surveyor can, by some mysterious means, direct his compass on the exact line, and find all the courses as if by magic. It often happens that the corners runs through clumpa of trees or other obstructions through which you cannot chain. In such a case I have often chosen an opening some degrees to right or left of the fence, and at certain distances driven posts till I found a perpendicular to the corner. Then, as the whole distance is to the perpendicular, so is each distance from the beginning to the perpendicular distance from the measured line to the fence, which, being correctly laid off, and posts driven at their extremities, will point out the true boundary. Of Levelling. The art of levelling consists in finding or tracing a line on a given portion of the earth's surface, parallel to the horizon at all points. The subject is too extensive to be comprised in this small treatise. I shall give an example, which it is hoped will enable the reader to do anything of that nature that may come in his way. Any one desirous of being fully informed on that subject, should consult BrufFs Engineering, where every...