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 57
Página 4
... feet in width , and there must be constantly kept at a distance , not being less than 5 yards in advance , at least one borehole near the centre , and sufficient flank boreholes on each side . In many districts the surveyor's work ...
... feet in width , and there must be constantly kept at a distance , not being less than 5 yards in advance , at least one borehole near the centre , and sufficient flank boreholes on each side . In many districts the surveyor's work ...
Página 8
... feet in length , one edge of the ruler being bevelled . It is of the utmost importance that the ruler for long lines be perfectly straight , or considerable discrepancy will arise in plotting . The ruler , therefore , should be tested ...
... feet in length , one edge of the ruler being bevelled . It is of the utmost importance that the ruler for long lines be perfectly straight , or considerable discrepancy will arise in plotting . The ruler , therefore , should be tested ...
Página 23
... feet and links to the scale of 17 feet 4 inches to an inch . As 17 feet 4 inches = 173 feet , to remove the fraction we Draw any may say the scale is ( 173 × 3 ) 52 feet to 3 inches . line AB ( Fig . 57 ) , and with III 23 GEOMETRY.
... feet and links to the scale of 17 feet 4 inches to an inch . As 17 feet 4 inches = 173 feet , to remove the fraction we Draw any may say the scale is ( 173 × 3 ) 52 feet to 3 inches . line AB ( Fig . 57 ) , and with III 23 GEOMETRY.
Página 24
... feet we know that the line of 3 inches has to be divided into fifty - two equal divisions . From A draw any line AC at an angle to AB and with any scale of equal parts mark off fifty - two divisions on AC . Join the fifty - second ...
... feet we know that the line of 3 inches has to be divided into fifty - two equal divisions . From A draw any line AC at an angle to AB and with any scale of equal parts mark off fifty - two divisions on AC . Join the fifty - second ...
Página 36
... 73 suppose the side AB the angle A 60 ° , and the angle B 45 ° . - 10 feet , AC sin B AB sin C 10 sin 45 ° .. AC = sin C Now the angle C 180 ° - ( 60 ° 36 CHAP . COLLIERY SURVEYING To find the Area of a Triangle Examples.
... 73 suppose the side AB the angle A 60 ° , and the angle B 45 ° . - 10 feet , AC sin B AB sin C 10 sin 45 ° .. AC = sin C Now the angle C 180 ° - ( 60 ° 36 CHAP . COLLIERY SURVEYING To find the Area of a Triangle Examples.
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.