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 52
Página 3
... roads and haulage planes . As the workings progress , it frequently happens that if a road be driven to connect two points ... road for a long circuit- ous route . A pit or shaft is sometimes required to be sunk from the surface to some ...
... roads and haulage planes . As the workings progress , it frequently happens that if a road be driven to connect two points ... road for a long circuit- ous route . A pit or shaft is sometimes required to be sunk from the surface to some ...
Página 43
... roads under- ground , the steel band is superior to any other form of measure . The writer has found the steel band of great service for surface work , and employs it for all important lines . When a considerable number of offsets are ...
... roads under- ground , the steel band is superior to any other form of measure . The writer has found the steel band of great service for surface work , and employs it for all important lines . When a considerable number of offsets are ...
Página 63
... road or a narrow field . The plan of a narrow field , and the method of surveying it by one chain line , is illus- trated by Fig . 96 . The notes , as given in the Field Book , appear below . No sketch has A -Scale of Chains wwww . FIG ...
... road or a narrow field . The plan of a narrow field , and the method of surveying it by one chain line , is illus- trated by Fig . 96 . The notes , as given in the Field Book , appear below . No sketch has A -Scale of Chains wwww . FIG ...
Página 65
... road and the method of surveying it As in the previous example , a line CHAIN LINE Scale 1 2 of Chains 3 4 FIG . 97 . is run in the best position for taking offsets , and as there are a number of different objects to be offsetted it has ...
... road and the method of surveying it As in the previous example , a line CHAIN LINE Scale 1 2 of Chains 3 4 FIG . 97 . is run in the best position for taking offsets , and as there are a number of different objects to be offsetted it has ...
Página 66
... 30 о 22 Survey of Road Link Chain . manner , because a triangle is the only figure in which the sides and angles bear a constant relation to each other 66 CHAP . COLLIERY SURVEYING 25 885 26 30 32 34 34 35 36 36 41 41 41 41 42 42.
... 30 о 22 Survey of Road Link Chain . manner , because a triangle is the only figure in which the sides and angles bear a constant relation to each other 66 CHAP . COLLIERY SURVEYING 25 885 26 30 32 34 34 35 36 36 41 41 41 41 42 42.
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.