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 77
... edge is the diameter of the semicircle , and the mark in the middle points out the centre , in a protractor in the form of a parallelogram : the divisions are , as in the semicircu- lar one , numbered both ways ; the blank side ...
... edge is the diameter of the semicircle , and the mark in the middle points out the centre , in a protractor in the form of a parallelogram : the divisions are , as in the semicircu- lar one , numbered both ways ; the blank side ...
Σελίδα 78
... edge or diameter exactly upon the line ; then the degree upon the limb that is cut by the line will be the measure of the given angle , which , in the present instance is found to be 60 degrees . 3. From a given point in a line to erect ...
... edge or diameter exactly upon the line ; then the degree upon the limb that is cut by the line will be the measure of the given angle , which , in the present instance is found to be 60 degrees . 3. From a given point in a line to erect ...
Σελίδα 129
... edge , and is in the middle between the two ends . To this centre - hole on the other side of the frame , there are the divisions of a semicircle , or 180 degrees ; and these again are subdivided into halves , or quarters , as the size ...
... edge , and is in the middle between the two ends . To this centre - hole on the other side of the frame , there are the divisions of a semicircle , or 180 degrees ; and these again are subdivided into halves , or quarters , as the size ...
Σελίδα 130
... edge of the index to the second station , direct your sights to the next ; draw a line by the edge of the index , and lay off the next line ; and proceed through the whole without using the needle , as you do with the theodolite . If ...
... edge of the index to the second station , direct your sights to the next ; draw a line by the edge of the index , and lay off the next line ; and proceed through the whole without using the needle , as you do with the theodolite . If ...
Σελίδα 132
... edge of the scale corresponding with that line , the divisions on the edge of the semicircle will run from 0 to 180 , from right to left : again , if it be turned the other way , or downwards , keeping the centre - hole thereof on the ...
... edge of the scale corresponding with that line , the divisions on the edge of the semicircle will run from 0 to 180 , from right to left : again , if it be turned the other way , or downwards , keeping the centre - hole thereof on the ...
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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.