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 ix
... Compass The Hedley Dial To take an Observation with the Dial To make a Survey The Survey Book • Surveying with the Magnetic Needle in the Presence of Iron 100 96 គឺ ៖ ម ន ៖ ឌ 90 92 CHAPTER XI THE VERNIER AND ITS USE- The Straight ...
... Compass The Hedley Dial To take an Observation with the Dial To make a Survey The Survey Book • Surveying with the Magnetic Needle in the Presence of Iron 100 96 គឺ ៖ ម ន ៖ ឌ 90 92 CHAPTER XI THE VERNIER AND ITS USE- The Straight ...
Página 2
... compass was turned until the magnetic needle coincided with a line marked on the bottom of the compass box , and the direction of each course was then marked on one or other of the wax circles by sighting across the compass . The ...
... compass was turned until the magnetic needle coincided with a line marked on the bottom of the compass box , and the direction of each course was then marked on one or other of the wax circles by sighting across the compass . The ...
Página 68
... compass : this is necessary to show on which side of the base line each triangle is formed , as otherwise no one but the person who made the survey would have the requisite knowledge , and the survey would be difficult for any one else ...
... compass : this is necessary to show on which side of the base line each triangle is formed , as otherwise no one but the person who made the survey would have the requisite knowledge , and the survey would be difficult for any one else ...
Página 88
... compass consists of a shallow brass box , on the inside of which is a raised ring graduated into the degrees of a ... compass box is shown by Fig . 106 , and for the purpose of comparison the face of a mariner's compass is shown by Fig ...
... compass consists of a shallow brass box , on the inside of which is a raised ring graduated into the degrees of a ... compass box is shown by Fig . 106 , and for the purpose of comparison the face of a mariner's compass is shown by Fig ...
Página 89
... compass face shown in Fig . 106 the east and west are in the contrary positions . The explanation is that the construction of the two compasses is different . In the mariner's compass the card on which the graduations or points are ...
... compass face shown in Fig . 106 the east and west are in the contrary positions . The explanation is that the construction of the two compasses is different . In the mariner's compass the card on which the graduations or points are ...
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.