Land and marine surveying1868 - 184 pages |
From inside the book
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Page 22
... intersect the two fields at about half- way , by sighting on a pole at B , or better , to avoid loss of time , by picking out the stem of a tree or some conspicuous bush that may answer the same purpose . Cast out the chain at A , and ...
... intersect the two fields at about half- way , by sighting on a pole at B , or better , to avoid loss of time , by picking out the stem of a tree or some conspicuous bush that may answer the same purpose . Cast out the chain at A , and ...
Page 24
... intersection measures 590. Now , in order to find this intersection on the two lines AC and DB - and it is very important that it should be obtained accurately , because it is a check to the whole of the work - let the surveyor stand at ...
... intersection measures 590. Now , in order to find this intersection on the two lines AC and DB - and it is very important that it should be obtained accurately , because it is a check to the whole of the work - let the surveyor stand at ...
Page 25
... intersection E ; it should give 595 , and from B again measure to the intersection at E , which should give 668 ; now draw in the straight line BC from the point в to the point c , which should measure 840 . If all this agrees with the ...
... intersection E ; it should give 595 , and from B again measure to the intersection at E , which should give 668 ; now draw in the straight line BC from the point в to the point c , which should measure 840 . If all this agrees with the ...
Page 26
... intersection of the diagonals , 1,340 . After this we had only to enter the intersection of a fence before reaching the pole at D. Having booked the chainage to D , 2,660 , we turned to the right again , entered ' line 3 , ' and ...
... intersection of the diagonals , 1,340 . After this we had only to enter the intersection of a fence before reaching the pole at D. Having booked the chainage to D , 2,660 , we turned to the right again , entered ' line 3 , ' and ...
Page 28
... intersect that already drawn ; the intersection will represent the point a ; apply the scale to these two arcs , from в and from D , to ascertain that the lengths are correct , and prick through the intersection . It may be observed ...
... intersect that already drawn ; the intersection will represent the point a ; apply the scale to these two arcs , from в and from D , to ascertain that the lengths are correct , and prick through the intersection . It may be observed ...
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Common terms and phrases
adjustment arrow ascertain base line beam compasses box sextant broad arrow centre chain line chainage chainman Chap clamp cloth co-efficients coincide compass correct cosine coversine depth difference distance divisions draw edge engineering equal error exactly feet long fence field book fixed gamboge gauge give Gunter's chain half high water horizon glass inches instance instrument intersection leader length loosen lunitidal intervals manner mark means measure ment minutes notch object observations obtained offset staff Outfall Sewer overfall Oyster Rock paper parallel parallel ruler pencil plot pole practice prick protractor quantity Railway rain gauge rainfall reading referred right angles road scale side sight sine square station straight line straight-edge streams suppose survey surveyor Tables taken telescope theodolite tie line timber tion tracing traverse triangle TRIGONOMETRY turn vernier plate vertical W. D. Hamilton woodcuts zero
Popular passages
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