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 15.
Σελίδα 31
... sight by the intermediate staff . In the same manner more intermediate staffs may be fixed . Again , assume that a ... back in the direction of A , and places the staff in the position at which B hides A from sight . He then goes on to D ...
... sight by the intermediate staff . In the same manner more intermediate staffs may be fixed . Again , assume that a ... back in the direction of A , and places the staff in the position at which B hides A from sight . He then goes on to D ...
Σελίδα 68
... back upon its pivot . The cams ( g and h ) only come into use when taking sights in steep places , or when taking ... sight has a comparatively wide opening , bisected ver- tically by a horsehair or wire stretched across it . Το take a sight ...
... back upon its pivot . The cams ( g and h ) only come into use when taking sights in steep places , or when taking ... sight has a comparatively wide opening , bisected ver- tically by a horsehair or wire stretched across it . Το take a sight ...
Σελίδα 78
... sight taken to the light held at the shaft . The north end of the dial should always be in the direction in which ... back to B , a forward sight to D , and the measure- ments are taken as before . As the return airway from D to the ...
... sight taken to the light held at the shaft . The north end of the dial should always be in the direction in which ... back to B , a forward sight to D , and the measure- ments are taken as before . As the return airway from D to the ...
Σελίδα 81
... back to see if the light held at the centre of the shaft was still in sight ; and as the road is straight the dial would be set up at A. As the N. end of the dial should be kept in the direction in which the survey is proceeding , he ...
... back to see if the light held at the centre of the shaft was still in sight ; and as the road is straight the dial would be set up at A. As the N. end of the dial should be kept in the direction in which the survey is proceeding , he ...
Σελίδα 84
... sight was taken . The best method of doing this is to have three sets of legs , any one of which will fit the dial . One set is sent ahead for the fore - sight , another remains behind Сури FIG . 99 . for the back - sight , the third ...
... sight was taken . The best method of doing this is to have three sets of legs , any one of which will fit the dial . One set is sent ahead for the fore - sight , another remains behind Сури FIG . 99 . for the back - sight , the third ...
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.