Colliery Surveying: A Primer Designed for the Use of Students and Colliery Manager AspirantsMacmillan, 1896 - 163 σελίδες |
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Σελίδα 69
... plates , and what was formerly the north sight vane may be near the south side graduations on the dial . The vernier ... plate which covers the face of the dial and adjust the instrument to a truly horizontal position . This is done by ...
... plates , and what was formerly the north sight vane may be near the south side graduations on the dial . The vernier ... plate which covers the face of the dial and adjust the instrument to a truly horizontal position . This is done by ...
Σελίδα 73
... It consists of two horizontal plates ( A ) , the lower one of which is graduated into degrees consecutively from 0 to 360 , and the upper one is the vernier plate . The vernier plate may be rotated X 73 SURVEYING INSTRUMENTS 13.
... It consists of two horizontal plates ( A ) , the lower one of which is graduated into degrees consecutively from 0 to 360 , and the upper one is the vernier plate . The vernier plate may be rotated X 73 SURVEYING INSTRUMENTS 13.
Σελίδα 74
... plate . The vernier plate may be rotated round the graduated plate , and the angle can be read off with the vernier . On the centre of the vernier plate is the compass box ( B ) , the circle of which is also graduated for magnetic ...
... plate . The vernier plate may be rotated round the graduated plate , and the angle can be read off with the vernier . On the centre of the vernier plate is the compass box ( B ) , the circle of which is also graduated for magnetic ...
Σελίδα 75
... plate is re- tained stationary , but the vernier plate , together with the telescope , etc. , may be turned to the second line of sight . When approximately adjusted the horizontal plates are again clamped by the screw ( O ) , and the ...
... plate is re- tained stationary , but the vernier plate , together with the telescope , etc. , may be turned to the second line of sight . When approximately adjusted the horizontal plates are again clamped by the screw ( O ) , and the ...
Σελίδα 91
... plate released by withdrawing the peg . The sights are then adjusted to the forward light , the reading of the vernier booked , the vernier turned back to XII 91 RACKING OR FAST NEEDLE SURVEYING Method with each Preceding Sight as Base ...
... plate released by withdrawing the peg . The sights are then adjusted to the forward light , the reading of the vernier booked , the vernier turned back to XII 91 RACKING OR FAST NEEDLE SURVEYING Method with each Preceding Sight as Base ...
Άλλες εκδόσεις - Προβολή όλων
Colliery Surveying: A Primer Designed for the Use of Students and Colliery ... Thomas Aloysius O'Donahue Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2018 |
Colliery Surveying: A Primer Designed for the Use of Students and Colliery ... Thomas Aloysius O'Donahue Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2016 |
Colliery Surveying: A Primer Designed for the Use of Students and Colliery ... Thomas Aloysius O'Donahue Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2017 |
Συχνά εμφανιζόμενοι όροι και φράσεις
accuracy acres ascertain back-sight base line bearing is taken calculated centre chain line clinometer colliery column commences correct bearing datum line deducted dial is clamped diameter direction distance dumpy level end of line equal example feet figure find the area fore-sight height horizontal inch inclination instrument isogonic lines legs length limb line drawn line of sight Link Chain loose needle bearing magnetic bearing magnetic declination magnetic meridian magnetic needle mark measurements meridian angle meridian line method Multiply necessary north and south north end number of degrees offsets ordinary parallel parallel ruler perpendicular placed plotted pricker PROB protractor reduced level right angles road ruler screw seam shaft shown by Fig side sight line spirit level square staff station straight line surveyor taking telescope theodolite triangle true north underground survey vane vernier plate vernier reading vertical angles Walney Island yards zero
Δημοφιλή αποσπάσματα
Σελίδα 20 - To draw a straight line at right angles to a given straight line, from a given point in the same.
Σελίδα 111 - Triangles on the same base, and between the same parallels, are equal.
Σελίδα 17 - Any two sides of a triangle are together greater than the third side.
Σελίδα 10 - A plane superficies is that in which any two points being taken, the straight line between them lies wholly in that superficies.
Σελίδα 14 - A diameter of a circle is a straight line drawn through the centre, and terminated both ways by the circumference.
Σελίδα 17 - When the three angles of one are equal to the three angles of the other, each to each, the adjoining diagram shews that the triangles need not be equal in all respects.
Σελίδα 24 - RULE. — Multiply half the sum of the two parallel sides by the perpendicular distance between them, and the product will be the area.
Σελίδα 13 - 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.
Σελίδα 20 - ... are together greater than the. third. Let A, B, C be the three given lines, any two of which are together greater than the third.
Σελίδα 19 - To bisect a given finite straight line, that is, to divide it into two equal parts. Let AB be the given straight line; it is required to divide it into two equal parts.