The Theory and Practice of Surveying: Containing All the Instructions Requisite for the Skilful Practice of this ArtJ.J. Harper, 1828 - 435 páginas |
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Página 9
... suppose unity or any one thing to be divided into any assigned number of equal parts , this number is called the denomi- nator ; and if we choose to take any number of such parts less than the whole , this is called the numerator of a ...
... suppose unity or any one thing to be divided into any assigned number of equal parts , this number is called the denomi- nator ; and if we choose to take any number of such parts less than the whole , this is called the numerator of a ...
Página 51
... suppose that to be Ag , which will be contained twice in AB , and three times in BD , the parts Ag , gB , Bh , hi , and i Ð being all * The arc BDC is not in length to bdc , as might be supposed from the sign of equality ; but they ...
... suppose that to be Ag , which will be contained twice in AB , and three times in BD , the parts Ag , gB , Bh , hi , and i Ð being all * The arc BDC is not in length to bdc , as might be supposed from the sign of equality ; but they ...
Página 60
... suppose of 45 degrees . From a scale of chords take 60 degrees , for 60 ° is equal to the radius , ( by cor . theo . 15. ) and with that distance from A , as a centre , describe a circle from the line AB ; 60 GEOMETRICAL.
... suppose of 45 degrees . From a scale of chords take 60 degrees , for 60 ° is equal to the radius , ( by cor . theo . 15. ) and with that distance from A , as a centre , describe a circle from the line AB ; 60 GEOMETRICAL.
Página 69
... ( suppose 60 ° ) is found thus . Make the given radius , suppose two inches , a transverse distance to 45 and 45 at the beginning of the scale of upper tangents ; and then the required number 60 ° 00 ′ may be taken from this scale . Given ...
... ( suppose 60 ° ) is found thus . Make the given radius , suppose two inches , a transverse distance to 45 and 45 at the beginning of the scale of upper tangents ; and then the required number 60 ° 00 ′ may be taken from this scale . Given ...
Página 71
... suppose it were required to set off from either of the scales of equal parts 8 , 36 , or 360 parts , either miles or leagues . Set one foot of your compasses on 3 , among the larger or primary divisions , and open the other point till ...
... suppose it were required to set off from either of the scales of equal parts 8 , 36 , or 360 parts , either miles or leagues . Set one foot of your compasses on 3 , among the larger or primary divisions , and open the other point till ...
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Términos y frases comunes
ABCD acres altitude Answer arch base bearing centre chains and links circle circumferentor Co-sec Co-tang column compasses contained cube root decimal difference of latitude Dist divided divisions divisor draw east Ecliptic edge EXAMPLE feet field-book figure four-pole chains given angle given number half the sum height Hence Horizon glass hypothenuse inches instrument length logarithm measure Meridian Altitude meridian distance method multiplied natural co-sine natural number natural sine Nonius number of degrees object observed off-sets opposite parallel parallelogram perches perpendicular plane prob PROBLEM proportional protractor Quadrant quotient radius rhombus right angles right line Secant sect semicircle Sextant side square root station subtract Sun's survey taken Tang tangent theo theodolite THEOREM trapezium triangle ABC trigonometry two-pole chains vane versed sine vulgar fraction whence