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 12
... divided into three sections , namely , Defini- tions , Theorems , and Problems . A theorem is an assertion or statement which is to be proved , and a problem is something required to be done . Euclid has demonstrated a large number of ...
... divided into three sections , namely , Defini- tions , Theorems , and Problems . A theorem is an assertion or statement which is to be proved , and a problem is something required to be done . Euclid has demonstrated a large number of ...
Página 16
... divided in 360 equal divisions , then each of these divisions is a degree , that is , the angle contained by two lines drawn from the centre to the circumference , and enclosing exactly one division , is called a degree . In the same ...
... divided in 360 equal divisions , then each of these divisions is a degree , that is , the angle contained by two lines drawn from the centre to the circumference , and enclosing exactly one division , is called a degree . In the same ...
Página 17
... divided into minutes , and minutes are again subdivided into seconds . Thus 60 seconds equal one minute , and 60 minutes equal one degree . For convenience and despatch in writing , a degree is noted by a small cypher ( ) being placed ...
... divided into minutes , and minutes are again subdivided into seconds . Thus 60 seconds equal one minute , and 60 minutes equal one degree . For convenience and despatch in writing , a degree is noted by a small cypher ( ) being placed ...
Página 20
... divided by straight lines into figures such that those contained by the square on the hypothenuse are equal to those contained found . 2 by the two squares of the sides adjacent to the right angle . may BC2 = = Ex . In the triangle ABC ...
... divided by straight lines into figures such that those contained by the square on the hypothenuse are equal to those contained found . 2 by the two squares of the sides adjacent to the right angle . may BC2 = = Ex . In the triangle ABC ...
Página 22
... equal parts . Let AB ( Fig . 54 ) be the given line . Suppose it is to be divided into four parts . Draw a line A3 , making any angle with AB , and through B draw B3 parallel to A3 . Set off along 22 CHAP . COLLIERY SURVEYING.
... equal parts . Let AB ( Fig . 54 ) be the given line . Suppose it is to be divided into four parts . Draw a line A3 , making any angle with AB , and through B draw B3 parallel to A3 . Set off along 22 CHAP . COLLIERY SURVEYING.
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.