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 31.
Σελίδα 33
... horizontally . For example , if the gradient was not too great 50 links might be taken at each operation , the leader ... horizontal measurement can then be calculated . D A full table of deductions , etc. , for incline MEASUREMENTS 33 ...
... horizontally . For example , if the gradient was not too great 50 links might be taken at each operation , the leader ... horizontal measurement can then be calculated . D A full table of deductions , etc. , for incline MEASUREMENTS 33 ...
Σελίδα 34
... horizontal . Approximate rule sufficiently correct for angles less than 20 degrees . Divide the number of degrees into 57 , and the result is the horizontal length per unit rise . EXAMPLES.- 57 6 degrees = 6.5 = 1 in 6.5 correct value 1 ...
... horizontal . Approximate rule sufficiently correct for angles less than 20 degrees . Divide the number of degrees into 57 , and the result is the horizontal length per unit rise . EXAMPLES.- 57 6 degrees = 6.5 = 1 in 6.5 correct value 1 ...
Σελίδα 40
... horizontal line DF , and measure the distance CB and the height of the instrument . Now plot a line DF of the length measured ( DF being equal to CB ) ; draw a line AB at right angles to DF , and from the point D plot an angle ADF equal ...
... horizontal line DF , and measure the distance CB and the height of the instrument . Now plot a line DF of the length measured ( DF being equal to CB ) ; draw a line AB at right angles to DF , and from the point D plot an angle ADF equal ...
Σελίδα 41
... horizontal line , and the lines DA to the top of the tower , and DB to the bottom of the tower ; measure the distance DB , and reduce the length to horizontal measure DE ( see table , p . 142 ) . Now plot the line DE to A FIG . 73 . FIG ...
... horizontal line , and the lines DA to the top of the tower , and DB to the bottom of the tower ; measure the distance DB , and reduce the length to horizontal measure DE ( see table , p . 142 ) . Now plot the line DE to A FIG . 73 . FIG ...
Σελίδα 55
... horizontal plane . When allowed freedom the needle oscillates from side to side for a short period , and finally settles in a line which is approximately north and south , the ends of the needle always maintaining these respective ...
... horizontal plane . When allowed freedom the needle oscillates from side to side for a short period , and finally settles in a line which is approximately north and south , the ends of the needle always maintaining these respective ...
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.