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 32
... possible by trigonometry to determine the other parts . The difference between an angle and 90 degrees is known as the complement of that angle ; for example , 60 degrees is the complement of 30 degrees , and vice versa 30 degrees is ...
... possible by trigonometry to determine the other parts . The difference between an angle and 90 degrees is known as the complement of that angle ; for example , 60 degrees is the complement of 30 degrees , and vice versa 30 degrees is ...
Página 46
... possible to staff out a line between two points though they may not be visible one from the other . Thus , in Fig . 79 , say it is required to staff out the line between A and D , which are B C A SECTION B PLAN FIG . 79 . invisible one ...
... possible to staff out a line between two points though they may not be visible one from the other . Thus , in Fig . 79 , say it is required to staff out the line between A and D , which are B C A SECTION B PLAN FIG . 79 . invisible one ...
Página 49
... possible , and AC and DF as long as possible , to ensure accuracy . A measurement between the points C and D gives the interrupted length of the line . Another method is to angle round the obstacle with an instrument and range out the ...
... possible , and AC and DF as long as possible , to ensure accuracy . A measurement between the points C and D gives the interrupted length of the line . Another method is to angle round the obstacle with an instrument and range out the ...
Página 52
... possible errors on an exaggerated scale . Offsets are shown taken from A , C , and E. When these are plotted at right angles to 1 . Tane Chain Line FIG . 85 . the chain line on the plan , the position of the fence and building is made ...
... possible errors on an exaggerated scale . Offsets are shown taken from A , C , and E. When these are plotted at right angles to 1 . Tane Chain Line FIG . 85 . the chain line on the plan , the position of the fence and building is made ...
Página 62
... possible , and consequently their number and position are determined by the locality of the objects which are to be offsetted . In making a survey it is first necessary to have some idea of the shape and extent of the place to be ...
... possible , and consequently their number and position are determined by the locality of the objects which are to be offsetted . In making a survey it is first necessary to have some idea of the shape and extent of the place to be ...
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.