Field and Colliery Surveying: A Primer Designed for the Use of Students of Surveying and Colliery Manager AspirantsMacmillan & Company, 1911 - 263 páginas |
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Página x
... Line in One Shaft Plumb Wires in Shaft CHAPTER XV PLOTTING SURVEYS-- Scales Offset Scales 134 136 138 140 141 142 Plotting Offsets Protractors and their Use Plotting Triangulation Surveys Plotting X COLLIERY SURVEYING.
... Line in One Shaft Plumb Wires in Shaft CHAPTER XV PLOTTING SURVEYS-- Scales Offset Scales 134 136 138 140 141 142 Plotting Offsets Protractors and their Use Plotting Triangulation Surveys Plotting X COLLIERY SURVEYING.
Página xi
... Protractors and their Use Plotting Triangulation Surveys Plotting Underground Surveys Plotting by Co - ordinates The Use of Traverse Tables CHAPTER XVI THE CALCULATION OF AREAS , ETC.- The Standard Measure of Area Casting by Triangles ...
... Protractors and their Use Plotting Triangulation Surveys Plotting Underground Surveys Plotting by Co - ordinates The Use of Traverse Tables CHAPTER XVI THE CALCULATION OF AREAS , ETC.- The Standard Measure of Area Casting by Triangles ...
Página 55
... protractor and a scale . The following examples cover all the cases that are likely to be met with in practice . EXAMPLE . To find the distance between the two points A and B ( Fig . 88 ) , which are inaccessible to each other by reason ...
... protractor and a scale . The following examples cover all the cases that are likely to be met with in practice . EXAMPLE . To find the distance between the two points A and B ( Fig . 88 ) , which are inaccessible to each other by reason ...
Página 128
... protractor is graduated in the same direction as the dial . The reason of this is that all the readings are taken in relation to the magnetic meridian , and the E. and W. require to be in the true geographical positions as with the ...
... protractor is graduated in the same direction as the dial . The reason of this is that all the readings are taken in relation to the magnetic meridian , and the E. and W. require to be in the true geographical positions as with the ...
Página 136
... protractor or by some other means a line is drawn 15 degrees from the sight line to obtain the direction of the magnetic meridian . A little consideration will show whether the meridian line should be to the right or left of the sight ...
... protractor or by some other means a line is drawn 15 degrees from the sight line to obtain the direction of the magnetic meridian . A little consideration will show whether the meridian line should be to the right or left of the sight ...
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.