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 40
Página xii
... Cross Staff The Abney Level The Box Sextant The Plane Table TABLE ON INCLINE MEASURE Explanation of the Table APPENDICES 215 216 216 218 220 222 I. TABLE OF NATURAL SINES , TANGENTS , ETC. 226 II . TRAVERSE TABLES 228 III . THE CITY AND ...
... Cross Staff The Abney Level The Box Sextant The Plane Table TABLE ON INCLINE MEASURE Explanation of the Table APPENDICES 215 216 216 218 220 222 I. TABLE OF NATURAL SINES , TANGENTS , ETC. 226 II . TRAVERSE TABLES 228 III . THE CITY AND ...
Página 3
... cross measure drift " is often made to " seat " another mine or the portion of a mine dislocated by a fault at a particular point , and the relative positions of the two points must be known before this can be done . Pillars of coal are ...
... cross measure drift " is often made to " seat " another mine or the portion of a mine dislocated by a fault at a particular point , and the relative positions of the two points must be known before this can be done . Pillars of coal are ...
Página 39
... 83.91 yards . ( 7 ) A seam of coal dipping 60 ° from the horizontal is found by a shaft at a depth of 200 yards . A horizontal cross- measure drift is set out from the shaft at a V 39 TRIGONOMETRICAL SOLUTION OF TRIANGLES.
... 83.91 yards . ( 7 ) A seam of coal dipping 60 ° from the horizontal is found by a shaft at a depth of 200 yards . A horizontal cross- measure drift is set out from the shaft at a V 39 TRIGONOMETRICAL SOLUTION OF TRIANGLES.
Página 48
... crosses some object over which it is difficult to measure . If the obstacle be a pond or similar object which does not interfere with the ranging out of the line , it offers no great difficulty , as a short line ( AC , Fig . 80 ) Main ...
... crosses some object over which it is difficult to measure . If the obstacle be a pond or similar object which does not interfere with the ranging out of the line , it offers no great difficulty , as a short line ( AC , Fig . 80 ) Main ...
Página 52
... cross - staff or some other instrument for setting off a right angle should be employed . The permissible length of an offset should be decided to a great extent by the nature of the object being offsetted . For the purpose of ...
... cross - staff or some other instrument for setting off a right angle should be employed . The permissible length of an offset should be decided to a great extent by the nature of the object being offsetted . For the purpose of ...
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.