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 40.
Σελίδα 2
... accurate plan of the workings of each mine to be kept , showing the workings up to a date not more than three months previously , and the general direction and rate of dip of the strata , together with a section of the strata sunk ...
... accurate plan of the workings of each mine to be kept , showing the workings up to a date not more than three months previously , and the general direction and rate of dip of the strata , together with a section of the strata sunk ...
Σελίδα 3
... for taking angular observa- tions , in general colliery use , is the Miner's Dial , and the most accurate is the Theodolite . CHAPTER II NOTES ON DRAWING The Drawing Board ( Fig I 3 INTRODUCTION General Survey Practice.
... for taking angular observa- tions , in general colliery use , is the Miner's Dial , and the most accurate is the Theodolite . CHAPTER II NOTES ON DRAWING The Drawing Board ( Fig I 3 INTRODUCTION General Survey Practice.
Σελίδα 4
... accuracy , the lead pencils employed in drafting a plan should be very sharp pointed , and comparatively hard pencils ( HH or HHH ) are therefore most suitable . A pencil for drawing lines should be sharpened to a flat edge somewhat ...
... accuracy , the lead pencils employed in drafting a plan should be very sharp pointed , and comparatively hard pencils ( HH or HHH ) are therefore most suitable . A pencil for drawing lines should be sharpened to a flat edge somewhat ...
Σελίδα 5
... accuracy that is usually necessary in drawing , and a pricker is therefore used for the purpose . A fine - pointed needle held in a clamp which is fitted with a suitable handle ( Fig . 3 ) makes the best pricker , but a needle with its ...
... accuracy that is usually necessary in drawing , and a pricker is therefore used for the purpose . A fine - pointed needle held in a clamp which is fitted with a suitable handle ( Fig . 3 ) makes the best pricker , but a needle with its ...
Σελίδα 28
... accurate measurement can be made in this manner , and many persons can measure 100 yards with an error of less than 1 yard . The Measuring Wheel . — This instrument consists of a wheel some 2 feet in diameter , which is provided with a ...
... accurate measurement can be made in this manner , and many persons can measure 100 yards with an error of less than 1 yard . The Measuring Wheel . — This instrument consists of a wheel some 2 feet in diameter , which is provided with 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
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.