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 σελίδες |
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Σελίδα 224
... vane sliding on the station - staff till the horizontal hair in 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 ...
... vane sliding on the station - staff till the horizontal hair in 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 ...
Σελίδα 225
... vane till the hair cuts the middle of it , and note down the feet , inches , and parts cut by the upper edge of the vane , which suppose to be 3 feet 8.4 inches : to this add the differ- ence 3 feet 0.6 inches , and the sum 6 feet 9 ...
... vane till the hair cuts the middle of it , and note down the feet , inches , and parts cut by the upper edge of the vane , which suppose to be 3 feet 8.4 inches : to this add the differ- ence 3 feet 0.6 inches , and the sum 6 feet 9 ...
Σελίδα 226
... vane that the hair in the tele- scope cuts the middle of the vane ; then in a book divided into two columns , the one entitled Back - sights , the other Fore - sights , enter the feet , inches , and parts cut by the upper edge of the ...
... vane that the hair in the tele- scope cuts the middle of the vane ; then in a book divided into two columns , the one entitled Back - sights , the other Fore - sights , enter the feet , inches , and parts cut by the upper edge of the ...
Σελίδα 236
... 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 , numbered 0 , 10 , 20 , 30 , & c . , from the right towards the left these are ...
... 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 , numbered 0 , 10 , 20 , 30 , & c . , from the right towards the left these are ...
Σελίδα 239
... vanes K and L are pieces of brass , standing per- pendicular to the plane of the instrument : the vane K is called the fore sight vane , and L the back sight vane . There are two oppo- holes in the fore sight vane , the lower of which ...
... vanes K and L are pieces of brass , standing per- pendicular to the plane of the instrument : the vane K is called the fore sight vane , and L the back sight vane . There are two oppo- holes in the fore sight vane , the lower of which ...
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Συχνά εμφανιζόμενοι όροι και φράσεις
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
Δημοφιλή αποσπάσματα
Σελίδα 173 - In like manner, when it is said, that " triangles on the same base, and between the same parallels, are equal...
Σελίδα 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.
Σελίδα 163 - RULE. From half the sum of the three sides subtract each side severally.
Σελίδα 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.
Σελίδα 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.
Σελίδα 41 - The radius of a circle is a right line drawn from the centre to the circumference.
Σελίδα 52 - Triangles upon equal bases, and between the same parallels, are equal to one another.
Σελίδα 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.
Σελίδα 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.