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 24.
Σελίδα 7
... assume that a line is required at right angles to AB ( Fig . 10 ) . Place the ruler with its edge along AB , and with a pencil or a pricker mark any point C in the line AB , and also mark the ruler at this point . Now parallel the ruler ...
... assume that a line is required at right angles to AB ( Fig . 10 ) . Place the ruler with its edge along AB , and with a pencil or a pricker mark any point C in the line AB , and also mark the ruler at this point . Now parallel the ruler ...
Σελίδα 21
... assuming AB to represent one , a small division would represent 1. A scale is usually defined by the number of the smaller divisions there are to an inch thus Fig . 56 would be known as a 20 scale , because AB is half an inch , and ...
... assuming AB to represent one , a small division would represent 1. A scale is usually defined by the number of the smaller divisions there are to an inch thus Fig . 56 would be known as a 20 scale , because AB is half an inch , and ...
Σελίδα 31
... 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 see quickly , then a few more staffs must be placed in ...
... 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 see quickly , then a few more staffs must be placed in ...
Σελίδα 32
... Assuming that the line AE ( Fig . 66 ) is to be measured , the leader takes ten arrows in one hand , and one arrow and the end of the chain in the other , and pulls the chain in the direction of the staff at B. The follower stands at ...
... Assuming that the line AE ( Fig . 66 ) is to be measured , the leader takes ten arrows in one hand , and one arrow and the end of the chain in the other , and pulls the chain in the direction of the staff at B. The follower stands at ...
Σελίδα 48
... the survey . As a simple example of triangulation , assume the survey to be of a single field with irregular sides , as shown by the plan ( Fig . 77 ) . The figure is , approximately speaking , oblong , and 48 CHAP . COLLIERY SURVEYING.
... the survey . As a simple example of triangulation , assume the survey to be of a single field with irregular sides , as shown by the plan ( Fig . 77 ) . The figure is , approximately speaking , oblong , and 48 CHAP . COLLIERY SURVEYING.
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
ABCD Fig accuracy acres arrows ascertain back-sight base line Beam compasses calculated centre chain line circle circumference clamped clinometer coal colliery column commences deducted Describe dial diameter direction distance divisions drawing dumpy level eleven arrows equal example exterior angle fast needle feet Field Book figure find the area fore-sight graduated height hypothenuse inch inclination instrument length Let AB Fig line CD line drawn link chain loose needle magnetic bearing magnetic meridian magnetic needle mark meridian angle meridian line method Multiply necessary needle bearing needle survey number of degrees observation offsets ordinary paper parallel parallel ruler parallelogram perpendicular placed plotted pricker PROB protractor quadrilateral radius reduced level right angles road ruler scale screw seam shaft shown sides sight line spirit level square staff station surveyor taken taking telescope theodolite triangle trigonometry underground survey vernier reading vertical yards
Δημοφιλή αποσπάσματα
Σελίδα 22 - To draw a straight line at right angles to a given straight line, from a given point in the same.
Σελίδα 113 - Triangles on the same base, and between the same parallels, are equal.
Σελίδα 19 - Any two sides of a triangle are together greater than the third side.
Σελίδα 12 - A plane superficies is that in which any two points being taken, the straight line between them lies wholly in that superficies.
Σελίδα 16 - A diameter of a circle is a straight line drawn through the centre, and terminated both ways by the circumference.
Σελίδα 19 - 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 26 - RULE. — Multiply half the sum of the two parallel sides by the perpendicular distance between them, and the product will be the area.
Σελίδα 15 - 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 22 - ... 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 21 - 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.