The Theory and Practice of Surveying: Containing All the Instructions Requisite for the Skilful Practice of this Art. With a New Set of Accurate Mathematical TablesHarper, 1832 - 348 σελίδες |
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Αποτελέσματα 1 - 5 από τα 16.
Σελίδα 9
... Circumferentor . 121 • • 125 • • 128 PART III . • 131 ib . The Plane Table ib . Mensuration of An- gles by these Instru- ments The Protractor 2. Mensuration of Heights 137 Of Distances 146 • 3. Mensuration of Areas 151 General Method ...
... Circumferentor . 121 • • 125 • • 128 PART III . • 131 ib . The Plane Table ib . Mensuration of An- gles by these Instru- ments The Protractor 2. Mensuration of Heights 137 Of Distances 146 • 3. Mensuration of Areas 151 General Method ...
Σελίδα 120
... D , so as to complete a parallelogram ; by reckoning off the same number of links you had in BC , from E to D , and pulling each part straight . THE CIRCUMFERENTOR . THIS instrument is composed of a brass 120 OF THE CHAIN .
... D , so as to complete a parallelogram ; by reckoning off the same number of links you had in BC , from E to D , and pulling each part straight . THE CIRCUMFERENTOR . THIS instrument is composed of a brass 120 OF THE CHAIN .
Σελίδα 121
... CIRCUMFERENTOR . THIS instrument is composed of a brass circular box , about five or six inches in diameter ; within which is a brass ring , divided on the top into 360 degrees , and numbered 10 ... CIRCUMFERENTOR . 121 The Circumferentor.
... CIRCUMFERENTOR . THIS instrument is composed of a brass circular box , about five or six inches in diameter ; within which is a brass ring , divided on the top into 360 degrees , and numbered 10 ... CIRCUMFERENTOR . 121 The Circumferentor.
Σελίδα 122
... thus : let your object stand at the point where you begin your survey , as at A ; leaving him there , proceed to your next angle B , where fix your instru- ment so that you may have the longest view possible 122 THE CIRCUMFERENTOR .
... thus : let your object stand at the point where you begin your survey , as at A ; leaving him there , proceed to your next angle B , where fix your instru- ment so that you may have the longest view possible 122 THE CIRCUMFERENTOR .
Σελίδα 123
... any alteration ; but , upon the whole , back - sights only will be found the readiest method . If your needle be pointed at each end , in taking fore - sights you may turn the north part of the box to F 2 THE CIRCUMFERENTOR . 123.
... any alteration ; but , upon the whole , back - sights only will be found the readiest method . If your needle be pointed at each end , in taking fore - sights you may turn the north part of the box to F 2 THE CIRCUMFERENTOR . 123.
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Συχνά εμφανιζόμενοι όροι και φράσεις
ABCD acres altitude arch azimuth base bearing blank line centre chains and links circle circumferentor co-sine column compasses contained cube root decimal diagonal diameter difference of latitude divided divisions divisor draw east ecliptic edge EXAMPLE feet field-book figure four-pole chains geometrical series given angle given number half the sum height Hence horizon glass hypothenuse inches instrument length logarithm manner measure meridian distance method multiplied needle nonius number of degrees object observed offsets opposite parallelogram perches perpendicular plane prob PROBLEM proportion protractor quadrant quotient radius rhombus right angles right line scale of equal SCHOLIUM screw secant sect sector semicircle side square root station stationary distance subtract suppose survey taken tangent theo theodolite THEOREM third trapezium triangle ABC trigonometry two-pole chains vane vulgar fraction whence
Δημοφιλή αποσπάσματα
Σελίδα 173 - In like manner, when it is said, that " triangles on the same base, and between the same parallels, are equal...
Σελίδα 49 - The angle in a semicircle is a right angle ; the angle in a segment greater than a semicircle is less than a right angle ; and the angle in a segment less than a semicircle is greater than a right angle.
Σελίδα 163 - RULE. From half the sum of the three sides subtract each side severally.
Σελίδα 41 - The circumference of every circle is supposed to be divided into 360 equal parts, called degrees ; and each degree into 60 equal parts, called minutes ; and each minute into 60 equal parts, called seconds ; and these into thirds, &c.
Σελίδα 97 - C' (89) (90) (91) (92) (93) 112. In any plane triangle, the sum of any two sides is to their difference as the tangent of half the sum of the opposite angles is to the tangent of half their difference.
Σελίδα 41 - The radius of a circle is a right line drawn from the centre to the circumference.
Σελίδα 52 - Triangles upon equal bases, and between the same parallels, are equal to one another.
Σελίδα 24 - The square of the sum of two numbers is equal to the square of the first number plus twice the product of the first and second number plus the square of the second number.
Σελίδα 35 - DIVISION BY LOGARITHMS. RULE. From the logarithm of the dividend subtract the logarithm of the divisor, and the number answering to the remainder will be the quotient required.