The Practice of Engineering Field Work, Applied to Land, Hydrographic, and Hyraulic Surveying and Levelling, for Railways, Canals, Harbours, Towns' Water Supply ... Including the Description and Use of Surveying and Levelling Instruments and the Practical Application of Trigonometrical TablesAtchley, 1858 - 324 σελίδες |
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Σελίδα 1
... the same principles are carried out ; for a maritime survey , where a great portion of the work is what we term " inaccessible , " another system has to be adopted ; B but they all resolve themselves into one thing , and CHAPTER I.
... the same principles are carried out ; for a maritime survey , where a great portion of the work is what we term " inaccessible , " another system has to be adopted ; B but they all resolve themselves into one thing , and CHAPTER I.
Σελίδα 6
... portion of the working day . But if , on the other hand , he is at once taught to keep his eyes on the forward object , as he drags the chain along , he will , at the chain's length , almost always find himself within a foot or so of ...
... portion of the working day . But if , on the other hand , he is at once taught to keep his eyes on the forward object , as he drags the chain along , he will , at the chain's length , almost always find himself within a foot or so of ...
Σελίδα 14
... portion of our subject with the following hint ; that it is unnecessary to offset to fences or other objects one or two chains off , if these have to be picked up upon other chain lines to be set out hereafter . If the reader has had no ...
... portion of our subject with the following hint ; that it is unnecessary to offset to fences or other objects one or two chains off , if these have to be picked up upon other chain lines to be set out hereafter . If the reader has had no ...
Σελίδα 18
... reader to practise all this until he finds himself familiar with this portion of the work ; then , and not till then , it will be time for him to study the laying STRAIGHT - EDGE . 19 out of a survey , 18 FIELD - BOOK ,
... reader to practise all this until he finds himself familiar with this portion of the work ; then , and not till then , it will be time for him to study the laying STRAIGHT - EDGE . 19 out of a survey , 18 FIELD - BOOK ,
Σελίδα 27
... portion ; and if we cannot do this , we must adopt another system of triangulation altogether . Therefore it is desir- able to keep our eyes open all the way as we first perambulate the district , for although we may not then be able to ...
... portion ; and if we cannot do this , we must adopt another system of triangulation altogether . Therefore it is desir- able to keep our eyes open all the way as we first perambulate the district , for although we may not then be able to ...
Συχνά εμφανιζόμενοι όροι και φράσεις
adjustment ascertain backsight base beam compasses bearing Bristol Channel centre chain line chainage channel chords circle clamp coefficient coincide column compass correct cosecant cosine coversine curve diameter difference of level direction distance ditto ditto divided Dumpy Level English Channel equal exterior angle fall feet fences field-book figures fixed gauge give given ground Gunter's chain half height Holyhead horizontal inches instrument intersection Irish Sea Length of Arc limb manner mark means miles minutes moon multiplied object observations obtain offsets overfall parallax parallel perpendicular plotted portion position practice protractor radius reading regard right angles rise scale secant sextant side sight sine square staff staff-holder station straight line stream subtended subtract surface survey tables taken tangent tangent screw tangential angle telescope theodolite tidal tion traverse triangle velocity vernier plate versine vertical zero دو
Δημοφιλή αποσπάσματα
Σελίδα 43 - IF a straight line touch a circle, and from the point of contact a straight line be drawn at right angles to the touching line, the centre of the circle shall be in that line.
Σελίδα 50 - If, at a point in a straight line, two other straight lines, upon the opposite sides of it, make the adjacent angles together equal to two right angles, these two straight lines shall be in one and the same straight line.
Σελίδα 50 - If a side of any triangle be produced, the exterior angle is equal to the two interior and opposite angles ; and the three interior angles of every triangle are equal to two right angles.
Σελίδα 45 - ... subtending the obtuse angle, is greater than the squares of the sides containing the obtuse angle, by twice the rectangle contained by the side upon which, when produced, the perpendicular falls, and the straight line intercepted without the triangle between the perpendicular and the obtuse angle. Let ABC be an obtuse-angled triangle, having the obtuse angle ACB, and from the point A let AD be drawn perpendicular to BC produced.
Σελίδα 44 - If a straight line be divided into any two parts, four times the rectangle contained by the whole line, and one of the parts, together with the square of the other part, is equal to the square of the straight line which is made up of the whole and that part.
Σελίδα 44 - If there be two straight lines, one of which is divided into any number of parts, the rectangle contained by the two straight lines is equal to the rectangles contained by the undivided line, and the several parts of the divided line.
Σελίδα 62 - But this is no derogation to their truth and certainty, no more than it is to the truth or certainty of the three angles of a triangle being equal to two right ones; because it is not so evident, as "the whole is bigger than a part;" nor so apt to be assented to at first hearing.
Σελίδα 169 - TO THEIR DIFFERENCE ; So IS THE TANGENT OF HALF THE SUM OF THE OPPOSITE ANGLES', To THE TANGENT OF HALF THEIR DIFFERENCE.
Σελίδα 50 - The angles which one straight line makes with another upon one side of it, are either two right angles, or are together equal to two right angles.
Σελίδα 45 - Therefore, in obtuse-angled triangles, &c. QED PROP. XIII. THEOREM. In every triangle, the square of the side subtending either of the acute angles is less than the squares of the sides containing that angle, by twice the rectangle contained by either of...