The Theory and Practice of Surveying: Containing All the Instructions Requisite for the Skilful Practice of this Art. With a New Set of Accurate Mathematical TablesA. S. Barnes, 1839 - 412 páginas |
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Página 120
... turn the chain over to D , so as to complete a parallelogram ; by reckoning off the same number of links THE CIRCUMFERENTOR . THIS instrument is composed of a brass you had in BC , from E to D , and pulling each part straight . * 120 OF ...
... turn the chain over to D , so as to complete a parallelogram ; by reckoning off the same number of links THE CIRCUMFERENTOR . THIS instrument is composed of a brass you had in BC , from E to D , and pulling each part straight . * 120 OF ...
Página 121
... turning the box so that the ends of the needle may be equidistant from its bottom , and it traverses or plays freely ) turn the flower - de - luce , or north part of the box , to your eye , and looking through the small aperture turn ...
... turning the box so that the ends of the needle may be equidistant from its bottom , and it traverses or plays freely ) turn the flower - de - luce , or north part of the box , to your eye , and looking through the small aperture turn ...
Página 123
... turn the south part of the box next your eye , and having cut your object at A , reckon the degrees to the south point of the needle , which will be the same as if they were taken from the object to the instrument , the direction of the ...
... turn the south part of the box next your eye , and having cut your object at A , reckon the degrees to the south point of the needle , which will be the same as if they were taken from the object to the instrument , the direction of the ...
Página 124
... turn the north part of the box to your eye , and count your degrees to the south part of the needle , as before ; or you may turn the south of the box to your eye , and count your de grees to the north end of the needle . But in back ...
... turn the north part of the box to your eye , and count your degrees to the south part of the needle , as before ; or you may turn the south of the box to your eye , and count your de grees to the north end of the needle . But in back ...
Página 125
... turn the whole about with the 360 from you ; direct the sights from A to G , and screw the instrument fast ; direct them from A to cut the object at B ; the degree then cut by that end of the index which is opposite you will be the ...
... turn the whole about with the 360 from you ; direct the sights from A to G , and screw the instrument fast ; direct them from A to cut the object at B ; the degree then cut by that end of the index which is opposite you will be the ...
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Términos y frases comunes
ABCD acres altitude arch base bearing blank line centre chains and links circle circumferentor column compasses contained Cosine Sine cube root decimal diagonal diameter difference of latitude 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 logarithm manner measure meridian distance multiplied needle nonius number of degrees object observed opposite parallelogram perches perpendicular plane prob PROBLEM proportion protractor quadrant quotient radius rhombus right angles right line scale of equal screw secant sect sector semicircle side Sine Cotang square root station stationary distance subtract suppose survey taken Tang tangent theo theodolite THEOREM trapezium triangle ABC trigonometry two-pole chains vane vulgar fraction whence
Pasajes populares
Página 49 - 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 41 - 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 41 - The radius of a circle is a right line drawn from the centre to the circumference.
Página 45 - A lemma is something which is premised, or demonstrated, in order to render what follows more easy. A corollary is a consequent truth derived immediately from some preceding truth or demonstration.
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 21 - 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.