Practical Surveying: A Text-book for Students Preparing for Examinations Or for Survey-work in the Colonies |
From inside the book
Results 1-5 of 21
Page xi
... BACK AND FORE SIGHT BASE LINES . BEAM COMPASS 216 , 217 , 227 , 231 , 241 , 175 , 176 , 183 , 242 35 . 292 , 293 . 185 , 192 , 193 23 235 179 , 180 , 184 246 135 13 • 60 , 61 , 62 135 134 • 16 , 17 BENCH MARKS BORDERS OF PLANS ...
... BACK AND FORE SIGHT BASE LINES . BEAM COMPASS 216 , 217 , 227 , 231 , 241 , 175 , 176 , 183 , 242 35 . 292 , 293 . 185 , 192 , 193 23 235 179 , 180 , 184 246 135 13 • 60 , 61 , 62 135 134 • 16 , 17 BENCH MARKS BORDERS OF PLANS ...
Page 19
... back , to prevent which , place your toe against the end , and so on until you have reached the point . A little ... sight is obtained than by being so close to the rod . It is advisable BP Fig . 28 . to`range out a number of ...
... back , to prevent which , place your toe against the end , and so on until you have reached the point . A little ... sight is obtained than by being so close to the rod . It is advisable BP Fig . 28 . to`range out a number of ...
Page 37
... back , в the sight- vane for the compass , and folding over it , in doing Fig . 66 . which it presses a knob which throws the card off its centre , and c is the sight - vane for the clinometer , which also folds back . Fig . 67 shows ...
... back , в the sight- vane for the compass , and folding over it , in doing Fig . 66 . which it presses a knob which throws the card off its centre , and c is the sight - vane for the clinometer , which also folds back . Fig . 67 shows ...
Page 39
... sight - vane c , and at the other is a magnifying prism B , enclosed in a metal case , having a slot for observation , so arranged that whilst the eye sights ... back on to the ring of the box , and is held in position by the movable strap b ...
... sight - vane c , and at the other is a magnifying prism B , enclosed in a metal case , having a slot for observation , so arranged that whilst the eye sights ... back on to the ring of the box , and is held in position by the movable strap b ...
Page 40
... sight ( B ) contains a vertical wire , whilst the corresponding slot in c is ... back or front . When out of use these sights or arms , by hinges , fold over ... sight . Thus , to take an observation , place the instrument directly over ...
... sight ( B ) contains a vertical wire , whilst the corresponding slot in c is ... back or front . When out of use these sights or arms , by hinges , fold over ... sight . Thus , to take an observation , place the instrument directly over ...
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Common terms and phrases
A B C accuracy accurately adjusted arrow axis back and fore back-sight beam compasses bench-mark boundaries centre chain chain-line check-lines chords clamped clinometer column commencement compass consequently Cosec cosine cross-wires curvature curve datum direction distance divided end of line equal feet fence field-book figures fixed fore sights ground hedge horizontal hypotenuse inches instrument intermediate intersection length level-book line A B line of collimation logarithm magnetic north mark means measured necessary observed offsets parallel plates pencil perpendicular plane plotted plumb-bob position post-and-rail fence quadrant radius reading reference right angles scale screw seen sextant side sine sketch slope square staff station straight line streets survey surveyor take the angle taken tangent tangential angle telescope theodolite tion traverse triangle trigonometry vernier vertical whilst Wimbledon Park wires zero
Popular passages
Page 86 - If two triangles have two sides of the one equal to two sides of the...
Page 89 - IF a straight line fall upon two parallel straight lines, it makes the alternate angles equal to one another; and the exterior angle equal to the interior and opposite upon...
Page 85 - When a straight line standing on another straight line makes the adjacent angles equal to one another, each of the angles is called a right angle ; and the straight line which stands on the other is called a perpendicular to it.
Page 61 - When you have proved that the three angles of every triangle are equal to two right angles...
Page 85 - A circle is a plane figure contained by one line, which is called the circumference, and is such, that all straight lines drawn from a certain point within the figure to the circumference are equal to one another : 16.
Page 92 - In any right-angled triangle, the square which is described on the side subtending the right angle is equal to the sum of the squares described on the sides which contain the right angle.
Page 116 - In any plane triangle, as the sum of the sides about the vertical angle is to their difference, so is the tangent of half the sum of the angles at the base to the tangent of half their difference.
Page 85 - A plane rectilineal angle is the inclination of two straight lines to one another, which meet together, but are not in the same straight line.
Page 127 - As the sum of the two given sides Is to their difference, So is the tangent of half the sum of their opposite angles To the tangent of half the difference of the same angles.
Page 85 - A diameter of a circle is a straight line drawn through the centre, and terminated both ways by the circumference.