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 121
... sights which are screwed to the index and stand perpendicular thereto in each sight is a large and a small aperture or slit , one over the other ; but these are changed , that is , if the large aperture be uppermost in the one sight ...
... sights which are screwed to the index and stand perpendicular thereto in each sight is a large and a small aperture or slit , one over the other ; but these are changed , that is , if the large aperture be uppermost in the one sight ...
Página 122
... sights directed to the object at C , and the north of the box next your eye , count your degrees to the south end of the needle , which register in your field - book in the sec- ond column opposite to station No. 2 ; then measure the ...
... sights directed to the object at C , and the north of the box next your eye , count your degrees to the south end of the needle , which register in your field - book in the sec- ond column opposite to station No. 2 ; then measure the ...
Página 123
... sights , will be able to go over nearly double the ground he could in the same time by taking fore - sights , because of overseeing the chaining ; for should he take back - sights he must be obliged , after taking his degree , to go ...
... sights , will be able to go over nearly double the ground he could in the same time by taking fore - sights , because of overseeing the chaining ; for should he take back - sights he must be obliged , after taking his degree , to go ...
Página 124
... sights you may turn the north of the box to your eye , and count your degrees to the north point of the needle ; or ... sights to the object , whether fore or back , as before , observe the two cardinal points of your compass the point ...
... sights you may turn the north of the box to your eye , and count your degrees to the north point of the needle ; or ... sights to the object , whether fore or back , as before , observe the two cardinal points of your compass the point ...
Página 125
... sights to B , and observe what degrees are cut by the south end of the needle , which let be 250 ° ; then turning the instrument about on its stand , direct the sights to G , note again what degrees are cut by the south end of the ...
... sights to B , and observe what degrees are cut by the south end of the needle , which let be 250 ° ; then turning the instrument about on its stand , direct the sights to G , note again what degrees are cut by the south end of 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.