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 1
... drawn on a plane surface . The principles upon which it depends are all embodied in the science of geometry ; so that surveying may be said to be a practical application of geometry . Early History of Surveying . - The art of surveying ...
... drawn on a plane surface . The principles upon which it depends are all embodied in the science of geometry ; so that surveying may be said to be a practical application of geometry . Early History of Surveying . - The art of surveying ...
Página 2
... . 66 The surveys are drawn or plotted on paper , and thus a map or plan is formed , which gives a comprehensive view of the extent of the " taking , " the state of 2 CHAP . COLLIERY SURVEYING The Importance of Colliery Surveying.
... . 66 The surveys are drawn or plotted on paper , and thus a map or plan is formed , which gives a comprehensive view of the extent of the " taking , " the state of 2 CHAP . COLLIERY SURVEYING The Importance of Colliery Surveying.
Página 5
... suitable . A pencil for drawing lines should be sharpened to a flat edge somewhat like the point of a chisel , as it can thus be made to draw a very. 5 CHAPTER II NOTES ON DRAWING- The Drawing Board 10 40 40 Drawing Paper The Pencil.
... suitable . A pencil for drawing lines should be sharpened to a flat edge somewhat like the point of a chisel , as it can thus be made to draw a very. 5 CHAPTER II NOTES ON DRAWING- The Drawing Board 10 40 40 Drawing Paper The Pencil.
Página 6
... drawn is determined by the width of opening between the points of the blades . A small milled - headed screw , connecting the two blades , allows the distance between them to be varied slightly , and thus alters the thickness of the ...
... drawn is determined by the width of opening between the points of the blades . A small milled - headed screw , connecting the two blades , allows the distance between them to be varied slightly , and thus alters the thickness of the ...
Página 7
... draw one line at right angles to another , to obviate the much less easily accomplished geometrical method . This ... drawn . A much more efficient parallel ruler ( Fig . 9 ) consists of a bevelled II NOTES ON DRAWING The T Square The ...
... draw one line at right angles to another , to obviate the much less easily accomplished geometrical method . This ... drawn . A much more efficient parallel ruler ( Fig . 9 ) consists of a bevelled II NOTES ON DRAWING The T Square 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.