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 38
Página 16
... manner theth part of the circum- ference of all circles contains a degree , and all degrees are equal . For , as was explained previously , it is not the length of the lines which enclose the angle that determine its magnitude , but the ...
... manner theth part of the circum- ference of all circles contains a degree , and all degrees are equal . For , as was explained previously , it is not the length of the lines which enclose the angle that determine its magnitude , but the ...
Página 23
... manner for any number of equal parts . VIII . To bisect a given angle . Let ABC ( Fig . 55 ) be the given angle . From B as centre , with any radius , describe the 3 B B 2 Α ́ 3 FIG . 55 . E FIG . 54 . Then the arc DE , from D and E as ...
... manner for any number of equal parts . VIII . To bisect a given angle . Let ABC ( Fig . 55 ) be the given angle . From B as centre , with any radius , describe the 3 B B 2 Α ́ 3 FIG . 55 . E FIG . 54 . Then the arc DE , from D and E as ...
Página 35
... manner previously given . Take the Other Triangles . — We will next take the case of any ordinary triangle not containing a right angle . triangle ABC ( Fig . 73 ) . AC AB BC ( 7 ) sin B sin C sin A In other words , any side divided by ...
... manner previously given . Take the Other Triangles . — We will next take the case of any ordinary triangle not containing a right angle . triangle ABC ( Fig . 73 ) . AC AB BC ( 7 ) sin B sin C sin A In other words , any side divided by ...
Página 36
... manner : —The two sides containing the angle are each squared and added , and then the square of the side opposite the angle is subtracted from the sum . The remainder is then divided by twice the product of the two sides containing the ...
... manner : —The two sides containing the angle are each squared and added , and then the square of the side opposite the angle is subtracted from the sum . The remainder is then divided by twice the product of the two sides containing the ...
Página 41
... manner , and many persons can measure 100 yards with an error of less than 1 yard . The Measuring Wheel . This instrument consists of a wheel some 2 feet in diameter , which is provided with a handle , by means of which the wheel is ...
... manner , and many persons can measure 100 yards with an error of less than 1 yard . The Measuring Wheel . This instrument consists of a wheel some 2 feet in diameter , which is provided with a handle , by means of which the wheel is ...
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.