Colliery Surveying: A Primer Designed for the Use of Students and Colliery Manager AspirantsMacmillan, 1896 - 163 σελίδες |
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Αποτελέσματα 1 - 5 από τα 9.
Σελίδα 70
... adjusted to the line of sight . Turn the dial round until the north end is towards the sight object — which in the case of an underground observation is a lamp - and with the eye applied to the narrow slit at the south vane adjust the ...
... adjusted to the line of sight . Turn the dial round until the north end is towards the sight object — which in the case of an underground observation is a lamp - and with the eye applied to the narrow slit at the south vane adjust the ...
Σελίδα 72
... adjusted to a greater degree of accuracy when taking vertical angles than the small spirit levels at the base of the dials admit of . The telescope is supported by two arms , rotating on an axis , which is the geometrical centre of the ...
... adjusted to a greater degree of accuracy when taking vertical angles than the small spirit levels at the base of the dials admit of . The telescope is supported by two arms , rotating on an axis , which is the geometrical centre of the ...
Σελίδα 73
... adjustment and reading . For loose needle surveying it is not so convenient as the dial , but for angling in important positions , especially on the surface where it can be manipulated easily , the theodolite is by far the better ...
... adjustment and reading . For loose needle surveying it is not so convenient as the dial , but for angling in important positions , especially on the surface where it can be manipulated easily , the theodolite is by far the better ...
Σελίδα 74
... adjusted to the line of sight by a slow motion or tangent screw ( M ) fitted below the horizontal plates . If the vertical angle is also required , the horizontal cross wire of the telescope must be made to cut the sight object by means ...
... adjusted to the line of sight by a slow motion or tangent screw ( M ) fitted below the horizontal plates . If the vertical angle is also required , the horizontal cross wire of the telescope must be made to cut the sight object by means ...
Σελίδα 75
... adjusted the horizontal plates are again clamped by the screw ( O ) , and the more correct adjustment made with another slow motion screw ( P ) . The angle which the vernier plate has passed through may then be read off by the vernier ...
... adjusted the horizontal plates are again clamped by the screw ( O ) , and the more correct adjustment made with another slow motion screw ( P ) . The angle which the vernier plate has passed through may then be read off by the vernier ...
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.