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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Σελίδα 6
... instruments used by surveyors . The fifth section contains Plane Trigonometry , right- angled and oblique , with a variety of rules and practical examples . The first section ( Part the Second ) gives an account of the chains and ...
... instruments used by surveyors . The fifth section contains Plane Trigonometry , right- angled and oblique , with a variety of rules and practical examples . The first section ( Part the Second ) gives an account of the chains and ...
Σελίδα 47
... instrument , Hadley's Quadrant , is founded on this corollary , annexed as an obvious consequence of the the- orem . A ray of light SA ( Pl . 14. fig . 2 ) from the sun , against the mirror at A , is reflected at an angle equal to its ...
... instrument , Hadley's Quadrant , is founded on this corollary , annexed as an obvious consequence of the the- orem . A ray of light SA ( Pl . 14. fig . 2 ) from the sun , against the mirror at A , is reflected at an angle equal to its ...
Σελίδα 48
... instrument , in its most improved state , and fitted with a telescope , forms the sextant , which , being admirably calculated for measuring angles in general , has rendered the most important services to geography and navigation ...
... instrument , in its most improved state , and fitted with a telescope , forms the sextant , which , being admirably calculated for measuring angles in general , has rendered the most important services to geography and navigation ...
Σελίδα 64
... INSTRUMENTS . THE strictness of geometrical demonstration admits of no other instruments than a rule and a pair of compasses . But , in proportion as the practice of geometry was extended to the different arts , either connected with or ...
... INSTRUMENTS . THE strictness of geometrical demonstration admits of no other instruments than a rule and a pair of compasses . But , in proportion as the practice of geometry was extended to the different arts , either connected with or ...
Σελίδα 65
... instruments ; these generally contain— A pair of six inch compasses with a moveable leg , an ink point , a dotting point , the crayon point , so contrived as to hold a whole pencil ... instruments , the protractor DRAWING INSTRUMENTS . 65.
... instruments ; these generally contain— A pair of six inch compasses with a moveable leg , an ink point , a dotting point , the crayon point , so contrived as to hold a whole pencil ... instruments , the protractor DRAWING INSTRUMENTS . 65.
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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.