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
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Página viii
... Examples CHAPTER VI MEASUREMENTS- Units of Measurements Methods of Measuring THE Pacing The Wheel The Tape The Steel Band Rods The Chain Staffing out . To measure a Line Obstacles to Measuring Incline Measuring Offsets Degree of ...
... Examples CHAPTER VI MEASUREMENTS- Units of Measurements Methods of Measuring THE Pacing The Wheel The Tape The Steel Band Rods The Chain Staffing out . To measure a Line Obstacles to Measuring Incline Measuring Offsets Degree of ...
Página 25
... of arc T = 3 · 1416 n ° = number of degrees in arc . a h C no FIG . 59 . f 1 For more detailed particulars and examples on Mensuration the student is referred to Mining Calculations . ( 2 ) and ( 3 ) p = d 25 MENSURATION- Lengths.
... of arc T = 3 · 1416 n ° = number of degrees in arc . a h C no FIG . 59 . f 1 For more detailed particulars and examples on Mensuration the student is referred to Mining Calculations . ( 2 ) and ( 3 ) p = d 25 MENSURATION- Lengths.
Página 32
... example , 60 degrees is the complement of 30 degrees , and vice versa 30 degrees is the complement of 60 degrees . The Trigonometrical Ratios . - To ascertain unknown A quantities in a triangle we make use of what FIG . 72 . are known ...
... example , 60 degrees is the complement of 30 degrees , and vice versa 30 degrees is the complement of 60 degrees . The Trigonometrical Ratios . - To ascertain unknown A quantities in a triangle we make use of what FIG . 72 . are known ...
Página 33
... example , in the triangle ABC , first considering the angle B , we get Perpendicular AC Hypothenuse AB sin B. Now consider the angle A ; the side opposite the angle being considered as perpendicular , therefore the base of the triangle ...
... example , in the triangle ABC , first considering the angle B , we get Perpendicular AC Hypothenuse AB sin B. Now consider the angle A ; the side opposite the angle being considered as perpendicular , therefore the base of the triangle ...
Página 34
... example , the sine of 4 degrees is given in the second column as 0697565 , and this is also the cosine of 86 degrees ; similarly the tangent of 4 degrees and the cotangent of 86 degrees is 069926 . The student may wish to know the ...
... example , the sine of 4 degrees is given in the second column as 0697565 , and this is also the cosine of 86 degrees ; similarly the tangent of 4 degrees and the cotangent of 86 degrees is 069926 . The student may wish to know 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.