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 24.
Σελίδα 60
... graduated to degrees , in which the vernier limit is one - twentieth of a degree , or three minutes . Theodolites and some of the improved miners ' dials are graduated to half degrees , and the vernier limit of reading is one minute ...
... graduated to degrees , in which the vernier limit is one - twentieth of a degree , or three minutes . Theodolites and some of the improved miners ' dials are graduated to half degrees , and the vernier limit of reading is one minute ...
Σελίδα 61
... graduation of the limb , will make this clearer . In Fig . 82 the 60 FIG . 82 . vernier is moved to the right of the limb zero . Now what is wanted is the angular distance it has been moved , that is , the number of degrees between the ...
... graduation of the limb , will make this clearer . In Fig . 82 the 60 FIG . 82 . vernier is moved to the right of the limb zero . Now what is wanted is the angular distance it has been moved , that is , the number of degrees between the ...
Σελίδα 62
... graduation is marked a . that the coinciding graduation is on the right hand vernier , and as the vernier has been moved from the zero of the limb to the right , it is the proceeding vernier , therefore the lower set of figures of the ...
... graduation is marked a . that the coinciding graduation is on the right hand vernier , and as the vernier has been moved from the zero of the limb to the right , it is the proceeding vernier , therefore the lower set of figures of the ...
Σελίδα 63
... graduation is a , and being on the right hand or backward part of the vernier , the vernier reading must be taken from the top row of figures . The " a " graduation is two divisions , or six minutes from the outer edge , which gives as ...
... graduation is a , and being on the right hand or backward part of the vernier , the vernier reading must be taken from the top row of figures . The " a " graduation is two divisions , or six minutes from the outer edge , which gives as ...
Σελίδα 65
... graduated into the degrees of a FIG . 87 . circle , viz . 360. On this circle the numbers are marked consecutively from 0 to 360 , but on another circle at the base of the box the graduations are in tens , and are numbered from the ...
... graduated into the degrees of a FIG . 87 . circle , viz . 360. On this circle the numbers are marked consecutively from 0 to 360 , but on another circle at the base of the box the graduations are in tens , and are numbered from the ...
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.