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 sider |
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Resultat 1-5 av 63
Side 57
... depth ; through this are pierced sights at right angles to each other , and it is adapted to a staff . This is to be used exactly in the same manner as the other . The optical square is very superior to the above for con- venience ...
... depth ; through this are pierced sights at right angles to each other , and it is adapted to a staff . This is to be used exactly in the same manner as the other . The optical square is very superior to the above for con- venience ...
Side 77
... the anterior side and the other on the posterior or silvered side ; errors may be occasioned by these double reflections , to prevent which the silvered side should be blackened . meter , and scarcely two inches in depth when shut.
... the anterior side and the other on the posterior or silvered side ; errors may be occasioned by these double reflections , to prevent which the silvered side should be blackened . meter , and scarcely two inches in depth when shut.
Side 78
W. Davis Haskoll. meter , and scarcely two inches in depth when shut up , and and yet it measures an angle to one minute , and if rather larger in size , to thirty seconds ; its construction and adjustments are pre- cisely similar to ...
W. Davis Haskoll. meter , and scarcely two inches in depth when shut up , and and yet it measures an angle to one minute , and if rather larger in size , to thirty seconds ; its construction and adjustments are pre- cisely similar to ...
Side 116
... depth of rain - fall , and numerous rain - gauges must be established at different points to corroborate or correct the information obtained . Not only all * See " Contour Levelling . " All the streams running into or crossing the ...
... depth of rain - fall , and numerous rain - gauges must be established at different points to corroborate or correct the information obtained . Not only all * See " Contour Levelling . " All the streams running into or crossing the ...
Side 117
... depth of this fall being transferred , the level thus found may again be traced forward until the same operation is repeated . As these levels are thus traced a stake may be driven where the levelling staff is held , so that a surveyor ...
... depth of this fall being transferred , the level thus found may again be traced forward until the same operation is repeated . As these levels are thus traced a stake may be driven where the levelling staff is held , so that a surveyor ...
Vanlige uttrykk og setninger
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
Populære avsnitt
Side 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.
Side 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.
Side 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.
Side 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.
Side 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.
Side 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.
Side 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.
Side 169 - TO THEIR DIFFERENCE ; So IS THE TANGENT OF HALF THE SUM OF THE OPPOSITE ANGLES', To THE TANGENT OF HALF THEIR DIFFERENCE.
Side 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.
Side 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...