Field and Colliery Surveying: A Primer Designed for the Use of Students of Surveying and Colliery Manager AspirantsMacmillan & Company, 1911 - 263 páginas |
Dentro del libro
Resultados 1-5 de 12
Página 93
... commence from or finish at , which is shown on the plan on which the survey is to be plotted . The usual procedure is to have two such stations , one to commence the survey from , and the other to finish at , in order that , when the ...
... commence from or finish at , which is shown on the plan on which the survey is to be plotted . The usual procedure is to have two such stations , one to commence the survey from , and the other to finish at , in order that , when the ...
Página 94
... commences . As the mine becomes extensively worked would be impracticable to survey from the shaft every time , so ... commence at one of the shafts , say the downcast , and pro- ceed round the workings , and , if possible , tie in at ...
... commences . As the mine becomes extensively worked would be impracticable to survey from the shaft every time , so ... commence at one of the shafts , say the downcast , and pro- ceed round the workings , and , if possible , tie in at ...
Página 95
... permanent station marks left at B and C , from which to commence subsequent surveys , to avoid the necessity of again surveying from the shafts , It is important when a back - sight has been X 95 SURVEYING WITH THE MAGNETIC NEEDLE.
... permanent station marks left at B and C , from which to commence subsequent surveys , to avoid the necessity of again surveying from the shafts , It is important when a back - sight has been X 95 SURVEYING WITH THE MAGNETIC NEEDLE.
Página 100
... commence- ment of the length 77 , instead of at the end , they would have been more reliable , for an error would have been disclosed in the plotting . An error in the last measurement to C or an error in the last bearing or measurement ...
... commence- ment of the length 77 , instead of at the end , they would have been more reliable , for an error would have been disclosed in the plotting . An error in the last measurement to C or an error in the last bearing or measurement ...
Página 142
... commences from the extreme end of the scale . Plotting Offsets . -To plot offsets the ordinary measuring scale is placed with its edge exactly along the chain line ( AB , Fig . 148 ) from which the offsets were taken , the zero of the ...
... commences from the extreme end of the scale . Plotting Offsets . -To plot offsets the ordinary measuring scale is placed with its edge exactly along the chain line ( AB , Fig . 148 ) from which the offsets were taken , the zero of the ...
Términos y frases comunes
accuracy accurate acres adjusted alidade ascertain back-sight calculated centre chain line chord clamped clinometer coal colliery column commences compass box contour lines datum line dial difference direction distance division drawing drawn dumpy level equal error example fast needle feet Field Book figure fixed fore-sight frustum graduated Gunter's chain height horizontal hypothenuse inch inclination instrument isogonic lines legs length limb magnetic bearing magnetic declination magnetic meridian magnetic needle marked means measurements meridian angle meridian base line meridian line method necessary needle survey observation obtained offsets parallel parallel ruler perpendicular placed plotted pricker protractor radius reduced level right angles road ruler scale screw seam shaft shown by Fig side sight line sight vanes spirit level square station straight line surveyor taken taking telescope theodolite tie line traverse triangle true north underground survey vernier plate vernier reading yards zero
Pasajes populares
Página 22 - To draw a straight line at right angles to a given straight line, from a given point in the same.
Página 164 - Triangles on the same base, and between the same parallels, are equal.
Página 19 - Any two sides of a triangle are together greater than the third side.
Página 249 - A section of the strata sunk through, or, if that is not reasonably " practicable, a statement of the depth of the shaft with a section
Página 248 - Every such plan must be on a scale of not less than that of the Ordnance Survey of twenty-five inches to the mile, or on the same scale as the plan for the time being in use at the mine.
Página 16 - A diameter of a circle is a straight line drawn through the centre, and terminated both ways by the circumference.
Página 19 - When the three angles of one are equal to the three angles of the other, each to each, the adjoining diagram shews that the triangles need not be equal in all respects.
Página 12 - A plane superficies is that in which any two points being taken, the straight line between them lies wholly in that superficies.
Página 21 - To bisect a given finite straight line, that is, to divide it into two equal parts. Let AB be the given straight line; it is required to divide it into two equal parts.
Página 34 - We have, then, that the sine of an angle is equal to the cosine of its complement, and conversely.