Colliery Surveying: A Primer Designed for the Use of Students and Colliery Manager AspirantsMacmillan, 1896 - 163 σελίδες |
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Σελίδα ix
... Limb Vernier The Arc Vernier . 609 59 60 CHAPTER X SURVEYING INSTRUMENTS— The Hedley Dial . 64 To make an Observation with the Dial 69 Improved Dials The Theodolite 13 71 73 CHAPTER XI SURVEYING WITH THE MAGNETIC NEEDLE- Ordinary Method ...
... Limb Vernier The Arc Vernier . 609 59 60 CHAPTER X SURVEYING INSTRUMENTS— The Hedley Dial . 64 To make an Observation with the Dial 69 Improved Dials The Theodolite 13 71 73 CHAPTER XI SURVEYING WITH THE MAGNETIC NEEDLE- Ordinary Method ...
Σελίδα 59
... limb . When the divisions of the vernier are larger than the limb divisions , it is known as a retrograde vernier , and when they are smaller , as a direct vernier . 1 10 10 Straight Limb Vernier . — Fig . 79 shows a straight limb ...
... limb . When the divisions of the vernier are larger than the limb divisions , it is known as a retrograde vernier , and when they are smaller , as a direct vernier . 1 10 10 Straight Limb Vernier . — Fig . 79 shows a straight limb ...
Σελίδα 60
... limb division . 1.5071.57 . To show how this is I a = 77 11 Then the reading is arrived at , take the division on the scale which coincides with the 7 , namely 8. To obtain the measurement , the seven divisions of the vernier will ...
... limb division . 1.5071.57 . To show how this is I a = 77 11 Then the reading is arrived at , take the division on the scale which coincides with the 7 , namely 8. To obtain the measurement , the seven divisions of the vernier will ...
Σελίδα 61
... limb , will make this clearer . In Fig . 82 the FIG . 82 . 10 Now what is vernier is moved to the right of the limb zero . wanted is the angular distance it has been moved , that is , the number of degrees between the zero of the limb ...
... limb , will make this clearer . In Fig . 82 the FIG . 82 . 10 Now what is vernier is moved to the right of the limb zero . wanted is the angular distance it has been moved , that is , the number of degrees between the zero of the limb ...
Σελίδα 62
... limb to the right , it is the proceeding vernier , therefore the lower set of figures of the vernier are read ... limb graduations . The reading on the limb opposite the zero of the vernier is between 39 and 40 , or 39+ a number of ...
... limb to the right , it is the proceeding vernier , therefore the lower set of figures of the vernier are read ... limb graduations . The reading on the limb opposite the zero of the vernier is between 39 and 40 , or 39+ a number of ...
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.