A Manual of Surveying for India, Detailing the Mode of Operations on the Revenue Surveys in Bengal and the North-western ProvincesW. Thacker, 1851 - 718 sider |
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Side 74
... moved towards D till the vernier indicates zero , or whatever number of degrees it was first adjusted to , and the mark at C has then only to be placed in the line AD , and bisected by the intersection of the cross wires of the ...
... moved towards D till the vernier indicates zero , or whatever number of degrees it was first adjusted to , and the mark at C has then only to be placed in the line AD , and bisected by the intersection of the cross wires of the ...
Side 119
... moved from the zero of the circle , then the first coincidence that takes place between a division of the Vernier with one on the circle , indicates the num- ber of minutes passed over . To read off an angle on the horizontal circle ...
... moved from the zero of the circle , then the first coincidence that takes place between a division of the Vernier with one on the circle , indicates the num- ber of minutes passed over . To read off an angle on the horizontal circle ...
Side 122
... moved before the face of the vernier for reading it off . Another arm clamps the opposite end of the horizontal axis by turning the screw , O , and has a tangent - screw at P , by which the vertical arc and telescope are moved very ...
... moved before the face of the vernier for reading it off . Another arm clamps the opposite end of the horizontal axis by turning the screw , O , and has a tangent - screw at P , by which the vertical arc and telescope are moved very ...
Side 127
... moved , both in a vertical and horizontal plane , and has a tangent - screw atttached for slow motion : its use is to detect any accidental derangement that may occur to the instrument whilst observ- ing , which may be done by it in the ...
... moved , both in a vertical and horizontal plane , and has a tangent - screw atttached for slow motion : its use is to detect any accidental derangement that may occur to the instrument whilst observ- ing , which may be done by it in the ...
Side 129
... moved . The instrument has also the power of repeating the measurement of an angle ; for the horizontal limb being firmly fixed to a centre , movable within the tripod support , R , and governed by a clamp and tangent- screw , s , can ...
... moved . The instrument has also the power of repeating the measurement of an angle ; for the horizontal limb being firmly fixed to a centre , movable within the tripod support , R , and governed by a clamp and tangent- screw , s , can ...
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Vanlige uttrykk og setninger
accuracy adjustment altitude angular axis azimuth base Beam Compass bisect boundary centre chord circle collimation compasses computation construction correct deducted degrees describe difference distance divided Draw the line drawn edge error feet Field-book figure fixed given line ground half height horizontal inches instrument intersection latitude length limb Logarithm longitude main circuit mark measure meridian method natural number object observed angle obtain offsets opposite parallax parallel parallelogram perpendicular plane plate polygon position PROB produced protractor radius Ray Trace reading rhombus right angles right line scale of equal screw segment sextant side Sine square station line straight line subtract Survey Surveyor taken talc tangent telescope Theo Theodolite triangle ABC Trigono Trigonometrical Trigonometrical Survey tube vernier vernier scale vertical village wires zero وو
Populære avsnitt
Side 7 - Things which are equal to the same thing are equal to one another. 2. If equals be added to equals the wholes are equal. 3. If equals be taken from equals the remainders are equal. 4. If equals be added to unequals the wholes are unequal. 5. If equals be taken from unequals the remainders are unequal. 6. Things which are double of the same are equal to one another.
Side 2 - But when a straight line standing upon another straight line makes the adjacent angles equal to one another, each of the angles is a right angle : (Ю.
Side 14 - The angle in a semicircle is a right angle ; the angle in a segment greater than a semicircle is less than a right angle ; and the angle in a segment less than a semicircle is greater than a right angle.
Side 12 - F, which is the common vertex of the triangles: that is », together with four right angles. Therefore all the angles of the figure, together with four right angles are equal to twice as many right angles as the figure has sides.
Side 240 - Upon the same base, and on the same side of it, there cannot be two triangles that have their sides which are terminated in one extremity of the base equal to one another, and likewise those which are terminated in the other extremity.
Side 2 - When several angles are at one point B, any one of them is expressed by three letters, of which the letter that is at the vertex of the angle, that is, at the point in which the straight lines that contain the angle meet one another, is put between the other two letters, and one of these two...
Side 4 - A diameter of a circle is a straight line drawn through the centre, and terminated both ways by the circumference.
Side 273 - All the interior angles of any rectilineal figure, together with four right angles, are equal to twice as many right angles as the figure has sides.
Side 149 - ... to make the objects appear on the other wire ; if the contact still remains perfect, the axis of the telescope is in proper adjustment ; if not, it must be altered by moving the two screws which fasten, to the up-and-down piece, the collar into which the telescope screws. This adjustment is not very liable to be deranged.
Side 5 - The circumference of every circle is supposed to be divided into 360 equal parts, called degrees...