Land and marine surveying1868 - 184 pages |
From inside the book
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Page 47
... limb . In one case , that in hand , the reading was 33 ° 10 ′ , and the length AB was 165 feet . Now observe that DB , which is the horizontal distance of B from A , is the line of the angle BAD ; from the tables of natural lines take ...
... limb . In one case , that in hand , the reading was 33 ° 10 ′ , and the length AB was 165 feet . Now observe that DB , which is the horizontal distance of B from A , is the line of the angle BAD ; from the tables of natural lines take ...
Page 66
... limb в C , although only 60 ° , is BC , divided as if it were 120 ° . The above is the principle of construction of the box sextant , which is represented in the annexed figure . M d B I is the index , to which motion is given by the ...
... limb в C , although only 60 ° , is BC , divided as if it were 120 ° . The above is the principle of construction of the box sextant , which is represented in the annexed figure . M d B I is the index , to which motion is given by the ...
Page 68
... limb ; this you can do to the greatest perfection by looking through the magnifier , M ; take care this is thoroughly well done . Now look through the pin - hole at the angle of some building or some tall straight flag - pole - if half ...
... limb ; this you can do to the greatest perfection by looking through the magnifier , M ; take care this is thoroughly well done . Now look through the pin - hole at the angle of some building or some tall straight flag - pole - if half ...
Page 69
... limb in exact contact with that of the upper limb , as seen through the unsilvered por- tion of the horizon glass : take the reading of the vernier ; now move the broad arrow of the vernier back , beyond the zero of the limb , until the ...
... limb in exact contact with that of the upper limb , as seen through the unsilvered por- tion of the horizon glass : take the reading of the vernier ; now move the broad arrow of the vernier back , beyond the zero of the limb , until the ...
Page 70
... limb is numbered both to the right and left , commencing at zero to 120 ° , and backward from 120 ° to 180 ° , and beyond to 230 ° ; the latter row of figures is farthest from the divisions , and belongs to the sup- plementary angles ...
... limb is numbered both to the right and left , commencing at zero to 120 ° , and backward from 120 ° to 180 ° , and beyond to 230 ° ; the latter row of figures is farthest from the divisions , and belongs to the sup- plementary angles ...
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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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