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 64
... extended to the different arts , either connected with or dependent upon it , new instruments became necessary , some to answer peculiar purposes , some to facilitate operation , and others to promote accuracy . As almost every artist ...
... extended to the different arts , either connected with or dependent upon it , new instruments became necessary , some to answer peculiar purposes , some to facilitate operation , and others to promote accuracy . As almost every artist ...
Página 66
... extended at pleasure , by pushing the furthermost leg outwards with the middle , or pressing it inwards with the fore- 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 fore- finger . In describing circles or arches , set one foot of the compasses on the centre , and then roll the head of ...
Página 67
... extended as to form an obtuse angle with the paper or plane on which they are used . The ink and crayon points have a joint just under that part which fits into the compasses ; by this they may be always so placed as to be set nearly ...
... extended as to form an obtuse angle with the paper or plane on which they are used . The ink and crayon points have a joint just under that part which fits into the compasses ; by this they may be always so placed as to be set nearly ...
Página 69
... extend to the most dis- tant , 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 dis- tant , 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 ...
Página 70
... the factors the parallel distance of 10 ; then the parallel distance of the other factor is the product . centre of the sector to 5 on the primary divisions Example . Multiply 5 by 6 : extend the compasses from the 70 MATHEMATICAL.
... the factors the parallel distance of 10 ; then the parallel distance of the other factor is the product . centre of the sector to 5 on the primary divisions Example . Multiply 5 by 6 : extend the compasses from the 70 MATHEMATICAL.
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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.