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 128
... offset : and surely this is as easily performed by the one pair on the moveable index : thus , if you lay the index to 360 and 180 , and cut the object either in the last or following station , screw the instrument fast and turn the ...
... offset : and surely this is as easily performed by the one pair on the moveable index : thus , if you lay the index to 360 and 180 , and cut the object either in the last or following station , screw the instrument fast and turn the ...
Σελίδα 136
... offsets and to ex- amine and adjust the chain . Five or six staves , of about five feet in length and one inch and a half in diameter , the upper part painted white , the lower end shod with iron , to be struck into the ground , as ...
... offsets and to ex- amine and adjust the chain . Five or six staves , of about five feet in length and one inch and a half in diameter , the upper part painted white , the lower end shod with iron , to be struck into the ground , as ...
Σελίδα 166
... offsets , which enters so largely into the practice of land surveying . In measuring a field of a very irregular shape , the principal points only are connected by straight lines , forming sides of the component triangles , and the ...
... offsets , which enters so largely into the practice of land surveying . In measuring a field of a very irregular shape , the principal points only are connected by straight lines , forming sides of the component triangles , and the ...
Σελίδα 200
... OFFSETS . IN taking surveys it is unnecessary and unusual to make a station at every angular point , because the field - work can be taken with much greater expedition by using offsets and in- tersections , and with equal certainty ...
... OFFSETS . IN taking surveys it is unnecessary and unusual to make a station at every angular point , because the field - work can be taken with much greater expedition by using offsets and in- tersections , and with equal certainty ...
Σελίδα 201
... offsets , it is necessary to have a perch chain , or a staff of half a perch , divided into links for measuring them ; for by this means the chain in the stationary line is undis- turbed , and the number of chains and links in that line ...
... offsets , it is necessary to have a perch chain , or a staff of half a perch , divided into links for measuring them ; for by this means the chain in the stationary line is undis- turbed , and the number of chains and links in that line ...
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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.