Practical Surveying: A Text-book for Students Preparing for Examinations Or for Survey-work in the ColoniesC. Lockwood and Son, 1889 - 272 σελίδες |
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Αποτελέσματα 1 - 5 από τα 27.
Σελίδα 3
... divided into 100 links . Each 10 links equal a metre , or 3.2809 ft . , so that a décamètre chain is 32.809 ft . , or nearly the length of half of our Gunter . Arrows . Accompanying each chain are 10 arrows , or skewers , about 9 in ...
... divided into 100 links . Each 10 links equal a metre , or 3.2809 ft . , so that a décamètre chain is 32.809 ft . , or nearly the length of half of our Gunter . Arrows . Accompanying each chain are 10 arrows , or skewers , about 9 in ...
Σελίδα 4
... divided into Figs . 1 and 2.- Offset Staff . pointed so as Red 50 links , similar to the chain . Poles . In order to mark out upon the ground any lines necessary for surveying purposes , poles from 10 to 20 ft . long , according to ...
... divided into Figs . 1 and 2.- Offset Staff . pointed so as Red 50 links , similar to the chain . Poles . In order to mark out upon the ground any lines necessary for surveying purposes , poles from 10 to 20 ft . long , according to ...
Σελίδα 24
... divided into triangles , and by C F all four triangles may be tied , although I should recommend a further check , such as D d . It does not always follow that a survey must consist only of triangles , although it is always advisable to ...
... divided into triangles , and by C F all four triangles may be tied , although I should recommend a further check , such as D d . It does not always follow that a survey must consist only of triangles , although it is always advisable to ...
Σελίδα 30
... divided into degrees and subdivisions , and , with a vernier attached to the upper cylinder , it is possible - with the greatest care to obtain the angle of one or more points , but this can only be regarded as approximate . Some ...
... divided into degrees and subdivisions , and , with a vernier attached to the upper cylinder , it is possible - with the greatest care to obtain the angle of one or more points , but this can only be regarded as approximate . Some ...
Σελίδα 32
... divided right and left of the line of quadrant into degrees and subdivisions H E Fig . 55 . of a degree . With a small plumb - bob attached to the centre it is possible , by elevating or depressing the line of diameter , to read off the ...
... divided right and left of the line of quadrant into degrees and subdivisions H E Fig . 55 . of a degree . With a small plumb - bob attached to the centre it is possible , by elevating or depressing the line of diameter , to read off the ...
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Συχνά εμφανιζόμενοι όροι και φράσεις
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
Δημοφιλή αποσπάσματα
Σελίδα 86 - If two triangles have two sides of the one equal to two sides of the...
Σελίδα 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...
Σελίδα 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.
Σελίδα 61 - When you have proved that the three angles of every triangle are equal to two right angles...
Σελίδα 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.
Σελίδα 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.
Σελίδα 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.
Σελίδα 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.
Σελίδα 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.
Σελίδα 85 - A diameter of a circle is a straight line drawn through the centre, and terminated both ways by the circumference.