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 86
... marked LIN . or L. Each of these scales , from the great ex- tensiveness of its use , is called the line of lines . 2. Two lines of chords , marked CHO . or c . 3. Two lines of secants , marked SEc . or s . A line of poly- gons , marked ...
... marked LIN . or L. Each of these scales , from the great ex- tensiveness of its use , is called the line of lines . 2. Two lines of chords , marked CHO . or c . 3. Two lines of secants , marked SEc . or s . A line of poly- gons , marked ...
Σελίδα 93
... marked SIN , of tangents marked TAN . of semitan- gents marked ST . and of secants marked sEc . this last is often upon the same line as the sines , be- cause its gradations do not begin till the sines end . There are two other scales ...
... marked SIN , of tangents marked TAN . of semitan- gents marked ST . and of secants marked sEc . this last is often upon the same line as the sines , be- cause its gradations do not begin till the sines end . There are two other scales ...
Σελίδα 96
... marked by the diago- nal upon the parallels , hundreth parts of the unit . But , if we suppose the larger divisions to be tens , the first subdivisions will be units , and the second tenths . If the larger are hundreds , then will the ...
... marked by the diago- nal upon the parallels , hundreth parts of the unit . But , if we suppose the larger divisions to be tens , the first subdivisions will be units , and the second tenths . If the larger are hundreds , then will the ...
Σελίδα 97
... marked upon the arch , will form the required an- gle . The degrees contained in an angle already laid down , are found nearly in the same manner ; for instance to measure an angle . From the centre describe an arch with the chord of 60 ...
... marked upon the arch , will form the required an- gle . The degrees contained in an angle already laid down , are found nearly in the same manner ; for instance to measure an angle . From the centre describe an arch with the chord of 60 ...
Σελίδα 99
... marked , is chamfered or sloped , away to the edge , that an angle may be more easily measured , and the divisions set off with greater exactness . Application of the protractor to use . 1. A num- ber of degrees being given , to ...
... marked , is chamfered or sloped , away to the edge , that an angle may be more easily measured , and the divisions set off with greater exactness . Application of the protractor to use . 1. A num- ber of degrees being given , to ...
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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.