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 80
... extended to the different arts , either connected with , or dependent upon it , new instru- ments became necessary , some to answer peculiar purposes , some to facilitate operation , and others to promote accuracy . As almost every ...
... extended to the different arts , either connected with , or dependent upon it , new instru- ments became necessary , some to answer peculiar purposes , some to facilitate operation , and others to promote accuracy . As almost every ...
Σελίδα 83
... extended at pleasure , by pushing the furthermost leg outwards with the middle , or pressing it inwards with the four finger . In describing circles , or arches , set one foot of the compasses on the centre , and then roll the head of ...
... extended at pleasure , by pushing the furthermost leg outwards with the middle , or pressing it inwards with the four finger . In describing circles , or arches , set one foot of the compasses on the centre , and then roll the head of ...
Σελίδα 87
... extend to the most distant ; those of the third , to the least ; those of the second , to the intermediate parallel . When the whole line of lines represents 100 , the divisions of the first order , or those to which the figures are ...
... extend to the most distant ; those of the third , to the least ; those of the second , to the intermediate parallel . When the whole line of lines represents 100 , the divisions of the first order , or those to which the figures are ...
Σελίδα 89
... extend the com- passes from the centre of the sector to 5 on the primary divisions , and open the sector till this distance become the parallel distance from 10 to 10 on the same divisions ; then the parallel dis- tance from 6 to 6 , ...
... extend the com- passes from the centre of the sector to 5 on the primary divisions , and open the sector till this distance become the parallel distance from 10 to 10 on the same divisions ; then the parallel dis- tance from 6 to 6 , ...
Σελίδα 90
... extended from the centre , shall reach to the third proportional 2. In all these cases , if the number to be made a parallel distance be too great for the sector , some aliquot part of it is to be taken , and the answer multiplied by ...
... extended from the centre , shall reach to the third proportional 2. In all these cases , if the number to be made a parallel distance be too great for the sector , some aliquot part of it is to be taken , and the answer multiplied by ...
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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.