The Theory and Practice of Surveying: Containing All the Instructions Requisite for the Skilful Practice of this Art |
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Page 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 ...
Page 36
... Quot . = Log.of.304959 ans . 4. Required the cube root of 12345 . Index 3 ) 4.091491 = Leg . of 12345 . 1,363830 = Quot . - Log . of 23.116 . Ans . 1440 SECTION IV . ELEMENTS OF PLANE GEOMETRY . DEFINITIONS 36 OF LOGARITHMS .
... Quot . = Log.of.304959 ans . 4. Required the cube root of 12345 . Index 3 ) 4.091491 = Leg . of 12345 . 1,363830 = Quot . - Log . of 23.116 . Ans . 1440 SECTION IV . ELEMENTS OF PLANE GEOMETRY . DEFINITIONS 36 OF LOGARITHMS .
Page 37
... PLANE GEOMETRY . DEFINITIONS . See PLATE I. 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 I. 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 ...
Page 75
... plane scale , a pair of compasses with a moveable leg , and twospare points , which may be applied occasion- ally 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 twospare points , which may be applied occasion- ally to the compasses ; one of these points is to hold ink ; the other , a porte crayon , for holding a piece of black - lead ...
Page 77
... a 90 de- and care should be taxes antto press formity them , but rather to let them as of the owl Tee the legs should never be værta vini de the four la one 3900 ot rol de reat of an obtuse angle with the paper or plane , on DRAWING INSTYT.
... a 90 de- and care should be taxes antto press formity them , but rather to let them as of the owl Tee the legs should never be værta vini de the four la one 3900 ot rol de reat of an obtuse angle with the paper or plane , on DRAWING INSTYT.
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Common terms and phrases
acres altitude Answer arch azimuth base bearing blank line centre chains and links chord circle circumferentor Co-sec Co-tang column compasses contained decimal difference distance line divided divisions draw east Ecliptic edge feet field-book figures fore four-pole chains geom given number half the sum Horizon glass hypothenuse inches instrument Lat Dep Lat latitude length logarithm measure meridian distance multiplied natural co-sine natural sine needle Nonius number of degrees object observed off-sets opposite parallel parallelogram pegs perches perpendicular plane pole pole star Portmarnock PROB protractor Quadrant quotient radius right angles right line scale of equal SCHOLIUM screw Secant sect Sextant side sights square station stationary distance subtract Sun's survey taken Tang tangent theo theodolite trapezium triangle ABC trigonometry two-pole chains vane versed sine vulgar fraction whence
Popular passages
Page 38 - 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.
Page 25 - 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.
Page 197 - RULE. From half the sum of the three sides subtract each side severally.
Page 106 - 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.
Page 27 - The VERSED SINE of an arc is that part of the diameter which is between the sine and the arc. Thus BA is the versed sine of the arc AG.