Colliery Surveying: A Primer Designed for the Use of Students and Colliery Manager AspirantsMacmillan, 1896 - 163 σελίδες |
Αναζήτηση στο βιβλίο
Αποτελέσματα 1 - 5 από τα 20.
Σελίδα 14
... exactly one division , is called a degree . In the same manner theth part of the circum- ference of all circles contains a degree , and all degrees are equal . For , as was explained previously , it is not the length of the lines which ...
... exactly one division , is called a degree . In the same manner theth part of the circum- ference of all circles contains a degree , and all degrees are equal . For , as was explained previously , it is not the length of the lines which ...
Σελίδα 31
... exactly in the line which it is required to measure . Assume that the distance between A and E ( Fig . 66 ) is required , and that a staff placed at E can just be seen from the point A , but not distinctly enough for the measurers to ...
... exactly in the line which it is required to measure . Assume that the distance between A and E ( Fig . 66 ) is required , and that a staff placed at E can just be seen from the point A , but not distinctly enough for the measurers to ...
Σελίδα 33
... exactly vertical , and the chain placed to it in order to ensure its being immediately over the mark . When incline measurements are required to be more accurate than can be ascertained by the foregoing method , an instrument should be ...
... exactly vertical , and the chain placed to it in order to ensure its being immediately over the mark . When incline measurements are required to be more accurate than can be ascertained by the foregoing method , an instrument should be ...
Σελίδα 56
... exactly corresponded with the geographical north and south line , but subsequent investigation has shown the fallacy of this supposition . All true magnets at the one place point in one direction , and to distinguish this line from the ...
... exactly corresponded with the geographical north and south line , but subsequent investigation has shown the fallacy of this supposition . All true magnets at the one place point in one direction , and to distinguish this line from the ...
Σελίδα 59
... exactly coincides with the point to be measured , the end of the limb or scale being the other end of the measurement . It is apparent , from the position shown in the figure , that the reading is between 1.5 and 1.6 inches , or 1.5+ a ...
... exactly coincides with the point to be measured , the end of the limb or scale being the other end of the measurement . It is apparent , from the position shown in the figure , that the reading is between 1.5 and 1.6 inches , or 1.5+ a ...
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.