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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Αποτελέσματα 1 - 5 από τα 38.
Σελίδα 22
... Bearings of Bases of Operation and Conditions that will alter Systems of Triangulation . - Suggestions as to the Study of Land Surveying . CHAIN Surveying , that is , with the chain only , is that to which the beginner should at first ...
... Bearings of Bases of Operation and Conditions that will alter Systems of Triangulation . - Suggestions as to the Study of Land Surveying . CHAIN Surveying , that is , with the chain only , is that to which the beginner should at first ...
Σελίδα 28
... bearing 15 ° east of north , and that he has marked some object in the distance having that bearing ; but having walked in that direction for some distance , perhaps half a mile , he sees before him something which makes it desirable to ...
... bearing 15 ° east of north , and that he has marked some object in the distance having that bearing ; but having walked in that direction for some distance , perhaps half a mile , he sees before him something which makes it desirable to ...
Σελίδα 59
... touching the spring ; the reading at the graduation on the compass card which appears as a prolongation of the thread gives the angle made by the line on which you are observing with the magnetic meridian . The bearing of a.
... touching the spring ; the reading at the graduation on the compass card which appears as a prolongation of the thread gives the angle made by the line on which you are observing with the magnetic meridian . The bearing of a.
Σελίδα 60
... bearing will be obtained more accurately , and it will be still more so if the bearing is again similarly taken at the other end of the line , and the mean taken again between the bearing at one end and at the other . This will also ...
... bearing will be obtained more accurately , and it will be still more so if the bearing is again similarly taken at the other end of the line , and the mean taken again between the bearing at one end and at the other . This will also ...
Σελίδα 61
... bearing of A B , and of a f , f , being a station on the line CD , and previously fixed for this purpose ; fix on some object , in the fence , for instance , near d , in line with af ; take also the bearing of a b , and chain to b ...
... bearing of A B , and of a f , f , being a station on the line CD , and previously fixed for this purpose ; fix on some object , in the fence , for instance , near d , in line with af ; take also the bearing of a b , and chain to b ...
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...