The Theory and Practice of Surveying: Containing All the Instructions Requisite for the Skillful Practice of this ArtE. Duyckinck, 1821 - 544 σελίδες |
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Σελίδα 44
... right ones , it is then called a right - lined angle , as ABC , fig . 4. If one of them be right and the other ... angles ADC , CDB on each side equal to each other , then those angles are called right angles , and the line CD a perpendi ...
... right ones , it is then called a right - lined angle , as ABC , fig . 4. If one of them be right and the other ... angles ADC , CDB on each side equal to each other , then those angles are called right angles , and the line CD a perpendi ...
Σελίδα 46
... right angles , and thus the periphery is divided into four equal parts , as BD , DA , AE and EB ; ( by def . 10. ) and so BD be- comes a quadrant or the fourth part of the peri- phery ; therefore the radius DC is always the sine of a ...
... right angles , and thus the periphery is divided into four equal parts , as BD , DA , AE and EB ; ( by def . 10. ) and so BD be- comes a quadrant or the fourth part of the peri- phery ; therefore the radius DC is always the sine of a ...
Σελίδα 47
... right - lined angle , is the arc of a circle swept from the angular point , and contained between the two lines that form the angle : thus the angle HCB ( fig . 8. ) is measur- ed by the arc HB , and is said to contain so many degrees ...
... right - lined angle , is the arc of a circle swept from the angular point , and contained between the two lines that form the angle : thus the angle HCB ( fig . 8. ) is measur- ed by the arc HB , and is said to contain so many degrees ...
Σελίδα 48
... right it is called a recti- lineal figure , if curved it is called a ... angles . 33. In respect to its sides it is either equilate- ral , having the ... angled , having one obtuse angle , 48 GEOMETRY .
... right it is called a recti- lineal figure , if curved it is called a ... angles . 33. In respect to its sides it is either equilate- ral , having the ... angled , having one obtuse angle , 48 GEOMETRY .
Σελίδα 49
... angles acute , as F. fig . 15 . 39. Acute and obtuse angled triangles are in general called oblique angled triangles ... right , is called a square , as ABCD , fig . 17 . 44. A parallelogram whose opposite sides are equal and angles ...
... angles acute , as F. fig . 15 . 39. Acute and obtuse angled triangles are in general called oblique angled triangles ... right , is called a square , as ABCD , fig . 17 . 44. A parallelogram whose opposite sides are equal and angles ...
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Συχνά εμφανιζόμενοι όροι και φράσεις
ABCD acres altitude Answer arch base bearing centre chains and links circle circumferentor Co-sec Co-tang column compasses contained cube root decimal diagonal difference of latitude Dist 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 Logarithms measure meridian distance multiplied Natural Co-sines natural number natural sine Nonius number of degrees object observed off-sets opposite parallelogram perches perpendicular plane pole PROB proportional protractor Quadrant quotient radius rhombus right angles right line screw Secant sect semicircle side square root station subtract survey taken tance Tang tangent theo theodolite trapezium triangle ABC trigonometry two-pole chains vane versed sine vulgar fraction whence
Δημοφιλή αποσπάσματα
Σελίδα 246 - ... that triangles on the same base and between the same parallels are equal...
Σελίδα 58 - 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 231 - RULE. From half the sum of the three sides subtract each side severally.
Σελίδα 45 - 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 14 - Then multiply the second and third terms together, and divide the product by the first term: the quotient will be the fourth term, or answer.
Σελίδα 5 - His method is founded on these three considerations: 1st, that the sum of the logarithms of any two numbers is the logarithm of the product of...
Σελίδα 91 - ... scale. Given the length of the sine, tangent, or secant of any degrees, to find the length of the radius to that sine, tangent, or secant.
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.
Σελίδα 30 - Then, because the sum of the logarithms of numbers, gives the logarithm of their product ; and the difference of the logarithms, gives the logarithm of the quotient of the numbers ; from the above two logarithms, and the logarithm of 10, which is 1, we may obtain a great many logarithms, as in the following examples : EXAMPLE 3.
Σελίδα 211 - At 170 feet distance from the bottom of a tower, the angle of its elevation was found to be 52° 30' : required the altitude of the tower ? Ans.