The Theory and Practice of Surveying: Containing All the Instructions Requisite for the Skillful Practice of this ArtE. Duyckinck, 1821 - 544 páginas |
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Página 99
... edge is the diameter of the semicircle , and the mark in the middle points out the centre , in a pro- tractor in the form of a parallelogram : the divi- sions are as in the semicircular one , numbered both ways ; the blank side ...
... edge is the diameter of the semicircle , and the mark in the middle points out the centre , in a pro- tractor in the form of a parallelogram : the divi- sions are as in the semicircular one , numbered both ways ; the blank side ...
Página 176
... other its complement to 360 . 4 There is a another centre hole about of the table's breadth from one edge , and is in the mid- This Instrument is not much used by Surveyors at present , dle between the two ends . To this centre - ( 176 )
... other its complement to 360 . 4 There is a another centre hole about of the table's breadth from one edge , and is in the mid- This Instrument is not much used by Surveyors at present , dle between the two ends . To this centre - ( 176 )
Página 177
... edge , at each end of which is a sight ; on the ruler are scales of equal parts , with and without diagonals , and a ... edge of the index , so as through the sights you may see the object in the last sta- tion , and by the edge of the ...
... edge , at each end of which is a sight ; on the ruler are scales of equal parts , with and without diagonals , and a ... edge of the index , so as through the sights you may see the object in the last sta- tion , and by the edge of the ...
Página 178
... edge of the index to the second station , direct your sights to the next ; draw a line by the edge of the index , and lay off the next line ; and proceed through the whole without using the the needle , as you do with the theodolite ...
... edge of the index to the second station , direct your sights to the next ; draw a line by the edge of the index , and lay off the next line ; and proceed through the whole without using the the needle , as you do with the theodolite ...
Página 179
... edge . Move your instru- ment back to the first station E , and proceed the contrary way to M , and to L ; but in going from thence to K , you again find your sheet will not hold it ; however , draw as much of the line LK on the sheet ...
... edge . Move your instru- ment back to the first station E , and proceed the contrary way to M , and to L ; but in going from thence to K , you again find your sheet will not hold it ; however , draw as much of the line LK on the sheet ...
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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 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
Pasajes populares
Página 246 - ... that triangles on the same base and between the same parallels are equal...
Página 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.
Página 231 - RULE. From half the sum of the three sides subtract each side severally.
Página 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.
Página 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.
Página 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...
Página 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.
Página 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.
Página 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.
Página 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.