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 6
... errors by the pen , when the survey does not close : also another new method for calculating the area , by having a parallel of latitude pass through the north or south point of the survey . The whole geometrically considered and de ...
... errors by the pen , when the survey does not close : also another new method for calculating the area , by having a parallel of latitude pass through the north or south point of the survey . The whole geometrically considered and de ...
Página 122
... error may be frequently com- mitted in using a two - pointed needle . Two - pointed needles have sometimes a ring , but more usually a cross towards the north end ; and the south end is generally bearded towards its extremity , and ...
... error may be frequently com- mitted in using a two - pointed needle . Two - pointed needles have sometimes a ring , but more usually a cross towards the north end ; and the south end is generally bearded towards its extremity , and ...
Página 134
... like manner proceed through the whole . In all protractions , if the end of the last station falls exactly in the point you began at , the field - work and protraction are truly · taken and performed ; if not , an error 131 THE PROTRACTOR .
... like manner proceed through the whole . In all protractions , if the end of the last station falls exactly in the point you began at , the field - work and protraction are truly · taken and performed ; if not , an error 131 THE PROTRACTOR .
Página 135
... error must have been commit- ted in one of them : in such case , make a second protraction ; if this agrees with the ... errors that he can neither account for nor correct . In the present state of science it may be laid down as a maxim ...
... error must have been commit- ted in one of them : in such case , make a second protraction ; if this agrees with the ... errors that he can neither account for nor correct . In the present state of science it may be laid down as a maxim ...
Página 138
... error committed in taking it makes the least error in the computed height of the object . In taking the height of a perpendicular object , if the observed angle be 45 ° , the height of the ob- ject above the horizontal line is equal to ...
... error committed in taking it makes the least error in the computed height of the object . In taking the height of a perpendicular object , if the observed angle be 45 ° , the height of the ob- ject above the horizontal line is equal to ...
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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.