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 17
Página ix
... 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 Limb CONTENTS ix.
... 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 Limb CONTENTS ix.
Página x
... Limb Vernier . The Arc Vernier CHAPTER XII IMPROVED SURVEYING INSTRUMENTS— The Modern Mining Dial The Theodolite The Hoffman Joint . · Slow Motion Attachment The Telescope CHAPTER XIII RACKING OR FAST NEEDLE SURVEYING- PAGE 104 105 110 ...
... Limb Vernier . The Arc Vernier CHAPTER XII IMPROVED SURVEYING INSTRUMENTS— The Modern Mining Dial The Theodolite The Hoffman Joint . · Slow Motion Attachment The Telescope CHAPTER XIII RACKING OR FAST NEEDLE SURVEYING- PAGE 104 105 110 ...
Página 86
... limb of the theodolite is turned so that the star may be sighted by the telescope when it is at the same altitude as was first observed . If the telescope has been retained at the same vertical angle , the positions which the star ...
... limb of the theodolite is turned so that the star may be sighted by the telescope when it is at the same altitude as was first observed . If the telescope has been retained at the same vertical angle , the positions which the star ...
Página 104
... limb . When the divisions of the vernier are larger than the limb divisions , it is known as a retrograde vernier , and when they are smaller , as a direct vernier . 10 Straight Limb Vernier . — Fig . 118 shows a straight limb ...
... limb . When the divisions of the vernier are larger than the limb divisions , it is known as a retrograde vernier , and when they are smaller , as a direct vernier . 10 Straight Limb Vernier . — Fig . 118 shows a straight limb ...
Página 105
... limb division . 1.5071 · 57 . To show how this is 11 Then the reading is arrived at , take the division on the scale which coincides with the 7 , namely 8. To obtain the measurement , the seven divisions of the vernier will require to ...
... limb division . 1.5071 · 57 . To show how this is 11 Then the reading is arrived at , take the division on the scale which coincides with the 7 , namely 8. To obtain the measurement , the seven divisions of the vernier will require to ...
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.