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 TablesHarper, 1832 - 348 páginas |
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Página 136
... glass . A station - pointer . For Marine Surveying . An azimuth compass . One or two boat compasses . Besides these , a number of measuring rods , iron pins , or ar- rows , & c . will be found very convenient , and two or three off- set ...
... glass . A station - pointer . For Marine Surveying . An azimuth compass . One or two boat compasses . Besides these , a number of measuring rods , iron pins , or ar- rows , & c . will be found very convenient , and two or three off- set ...
Página 222
... glass will measure its drift . And these ought to be noted on the draught , which may be thus : The currents may be shown , by drawing a dart pointing out its setting , and its drift by the Roman capital letters , the depth of the water ...
... glass will measure its drift . And these ought to be noted on the draught , which may be thus : The currents may be shown , by drawing a dart pointing out its setting , and its drift by the Roman capital letters , the depth of the water ...
Página 224
... glass cuts the middle of that vane ; then see how many feet , inches , and parts are cut by the upper part of the vane , which suppose to be 3 feet 4 inches and 6 tenths . In like manner direct to the other staff at B , and suppose the ...
... glass cuts the middle of that vane ; then see how many feet , inches , and parts are cut by the upper part of the vane , which suppose to be 3 feet 4 inches and 6 tenths . In like manner direct to the other staff at B , and suppose the ...
Página 236
... glass F , the horizon glasses G and H , the dark glasses or screens I , and the sight vanes K and L. The arch , or limb BC , although only the eighth part of a circle , is , on account of the double reflection , divided into 90 degrees ...
... glass F , the horizon glasses G and H , the dark glasses or screens I , and the sight vanes K and L. The arch , or limb BC , although only the eighth part of a circle , is , on account of the double reflection , divided into 90 degrees ...
Página 238
... glass is designed to reflect the image of the sun , or any other object , upon either of the two horizon glasses , from whence it is reflected to the eye of the observer . The brass frame , with the glass , is fixed to the index by the ...
... glass is designed to reflect the image of the sun , or any other object , upon either of the two horizon glasses , from whence it is reflected to the eye of the observer . The brass frame , with the glass , is fixed to the index by the ...
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Términos y frases comunes
ABCD acres altitude arch azimuth base bearing blank line centre chains and links circle circumferentor co-sine column compasses contained 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 method multiplied needle nonius number of degrees object observed offsets opposite parallelogram perches perpendicular plane prob PROBLEM proportion protractor quadrant quotient radius rhombus right angles right line scale of equal SCHOLIUM screw secant sect sector semicircle side square root station stationary distance subtract suppose survey taken tangent theo theodolite THEOREM third trapezium triangle ABC trigonometry two-pole chains vane vulgar fraction whence
Pasajes populares
Página 173 - In like manner, when it is said, that " triangles on the same base, and between the same parallels, are equal...
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 163 - RULE. From half the sum of the three sides subtract each side severally.
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 97 - C' (89) (90) (91) (92) (93) 112. In any plane triangle, the sum of any two sides is to their difference as the tangent of half the sum of the opposite angles is to the tangent of half their difference.
Página 41 - The radius of a circle is a right line drawn from the centre to the circumference.
Página 52 - Triangles upon equal bases, and between the same parallels, are equal to one another.
Página 24 - The square of the sum of two numbers is equal to the square of the first number plus twice the product of the first and second number plus the square of the second number.
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.