## Field and Colliery Surveying: A Primer Designed for the Use of Students of Surveying and Colliery Manager Aspirants |

### Common terms and phrases

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

### Popular passages

Page 22 - To draw a straight line at right angles to a given straight line, from a given point in the same.

Page 164 - Triangles on the same base, and between the same parallels, are equal.

Page 19 - Any two sides of a triangle are together greater than the third side.

Page 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

Page 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.

Page 16 - A diameter of a circle is a straight line drawn through the centre, and terminated both ways by the circumference.

Page 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.

Page 12 - A plane superficies is that in which any two points being taken, the straight line between them lies wholly in that superficies.

Page 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.

Page 34 - We have, then, that the sine of an angle is equal to the cosine of its complement, and conversely.