The Theory and Practice of Surveying: Containing All the Instructions Requisite for the Skilful Practice of this ArtEvert Duyckinck, 1814 - 508 σελίδες |
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Σελίδα 2
... Plane Trigonometry . SECTION I. DECIMAL FRACTIONS . If we suppose unity or any one thing to be di- vided into any assigned number of equal parts , this number is called the denominator ; and if we chuse to take any number of such parts ...
... Plane Trigonometry . SECTION I. DECIMAL FRACTIONS . If we suppose unity or any one thing to be di- vided into any assigned number of equal parts , this number is called the denominator ; and if we chuse to take any number of such parts ...
Σελίδα 36
... 1.484241 - Quot . - Log.of.304959 = ans . 4. Required the cube root of 12345 . Index 3 ) 4.091491 = Log . of 12345 . 1.363830 = Quot . = Log . of 23.116 . — Ans SECTION IV . ELEMENTS OF PLANE GEOMETRY . DEFINITIONS . 36 OF LOGARITHMS .
... 1.484241 - Quot . - Log.of.304959 = ans . 4. Required the cube root of 12345 . Index 3 ) 4.091491 = Log . of 12345 . 1.363830 = Quot . = Log . of 23.116 . — Ans SECTION IV . ELEMENTS OF PLANE GEOMETRY . DEFINITIONS . 36 OF LOGARITHMS .
Σελίδα 37
... PLANE GEOMETRY . DEFINITIONS . See PLATE 1 . 1. GEOMETRY is that science wherein we consider the properties of magnitude . 2. A point is that which has no parts , being of itself indivisible ; as A. 3. A line has length but no breadth ...
... PLANE GEOMETRY . DEFINITIONS . See PLATE 1 . 1. GEOMETRY is that science wherein we consider the properties of magnitude . 2. A point is that which has no parts , being of itself indivisible ; as A. 3. A line has length but no breadth ...
Σελίδα 75
... plane scale , a pair of compasses with a moveable leg , and two spare points , which may be applied occasionally to the compasses ; one of these points is to hold ink ; the other , a porte crayon , for holding a piece of black - lead ...
... plane scale , a pair of compasses with a moveable leg , and two spare points , which may be applied occasionally to the compasses ; one of these points is to hold ink ; the other , a porte crayon , for holding a piece of black - lead ...
Σελίδα 77
... care should be taken not to press forcibly upon them , but rather to let them act by their own weight ; the legs should never be so far extended , as to form an obtuse angle with the paper or plane , on DRAWING INSTRUMENTS . 77.
... care should be taken not to press forcibly upon them , but rather to let them act by their own weight ; the legs should never be so far extended , as to form an obtuse angle with the paper or plane , on DRAWING INSTRUMENTS . 77.
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Συχνά εμφανιζόμενοι όροι και φράσεις
acres altitude Answer arch base bearing blank line centre chains and links circle circle of latitude circumferentor Co-sec Co-tang column compasses contained decimal difference Dist divided divisions draw east Ecliptic edge EXAMPLE feet field-book figures fore four-pole chains geometrical series given angle given number half the sum Horizon glass hypothenuse inches instrument latitude length logarithm measure meridian distance minutes multiplied natural sine Nonius number of degrees object observed off-sets opposite parallelogram perches perpendicular plane pole pole star PROB proportion protractor Quadrant quotient radius right angles right line scale of equal SCHOLIUM screw Secant sect semicircle side sights square root station stationary distance subtracted survey taken tance Tang tangent theo theodolite trapezium triangle ABC trigonometry two-pole chains vane versed sine vulgar fraction whence
Δημοφιλή αποσπάσματα
Σελίδα 52 - 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 39 - The Circumference of every circle is supposed to be divided into 360 equal parts, called Degrees ; and each degree into 60 Minutes, each minute into 60 Seconds, and so on.
Σελίδα 18 - DISTINGUISH the given number into periods of two figures each, by putting a point over the place of units, another over the place of hundreds, and so on, which points shew the number of figures the root will consist of. 2. " FIND the greatest square number in the first, or left hand period...
Σελίδα 120 - 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 31 - 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.
Σελίδα 87 - On the line of lines make the lateral distance 10, a transverse distance between 8 on one leg, and 6 on the other leg. On the line of sines make the lateral distance 90, a transverse distance from 45 to 45 ; or from 40 to 50 ; or from 30 to 60 ; or from the sine of any degree to their complement.
Σελίδα 7 - RULE. Divide as in whole numbers, and from the right hand of the quotient point off as many places for decimals as the decimal places in the dividend exceed those in the divisor.
Σελίδα 82 - ... longer than the intermediate adjacent ones, these are whole degrees ; the shorter ones, or those of the third order, are 30 minutes. From the centre, to 60 degrees, the line of sines is divided like the line of tangents ; from 60 to 70, it is divided only to every degree ; from 70 to 80, to every two degrees ; from 80 to 90, the division must be estimated by the eye.