Colliery Surveying: A Primer Designed for the Use of Students and Colliery Manager AspirantsMacmillan, 1896 - 163 σελίδες |
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Σελίδα 66
... instrument to be levelled . The inner circles are connected rigidly on the cylindrical piece of metal which forms the cap of the legs , and if the dial be first clamped on the legs by the screw ( f ) 66 CHAP . COLLIERY SURVEYING.
... instrument to be levelled . The inner circles are connected rigidly on the cylindrical piece of metal which forms the cap of the legs , and if the dial be first clamped on the legs by the screw ( f ) 66 CHAP . COLLIERY SURVEYING.
Σελίδα 67
... clamped on the legs by the screw ( f ) and the peg ( c ) taken out , the sights can be moved in any direction required by turning the large milled head screw ( b ) , and as the vernier is in the α FIG . 89 . exact line between the ...
... clamped on the legs by the screw ( f ) and the peg ( c ) taken out , the sights can be moved in any direction required by turning the large milled head screw ( b ) , and as the vernier is in the α FIG . 89 . exact line between the ...
Σελίδα 74
... clamped on the vertical axis above the parallel plate by a thumb screw ( K ) ; another screw ( L ) on the upper portion of the instru- ment clamping the telescope . The telescope can now be correctly adjusted to the line of sight by a ...
... clamped on the vertical axis above the parallel plate by a thumb screw ( K ) ; another screw ( L ) on the upper portion of the instru- ment clamping the telescope . The telescope can now be correctly adjusted to the line of sight by a ...
Σελίδα 75
... clamping screw ( O ) , which holds it in this position , should be released in order to adjust the instrument to the ... clamped by the screw ( O ) , and the more correct adjustment made with another slow motion screw ( P ) . The angle ...
... clamping screw ( O ) , which holds it in this position , should be released in order to adjust the instrument to the ... clamped by the screw ( O ) , and the more correct adjustment made with another slow motion screw ( P ) . The angle ...
Σελίδα 78
... clamped on the legs , and the needle having settled , the bearing is read off . In the meantime an assistant has pro- ceeded towards B , and as the road is straight a sight can be taken to this point . The dial is unclamped but not ...
... clamped on the legs , and the needle having settled , the bearing is read off . In the meantime an assistant has pro- ceeded towards B , and as the road is straight a sight can be taken to this point . The dial is unclamped but not ...
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.