A Practical Treatise on the Science of Land and Engineering Surveying, Levelling, Estimating Quantities, &eE. & F. N. Spon, 1863 |
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Σελίδα 3
... intersecting triangles . There are certain cases where a theodo- lite is indispensable - such as a town or village , hilly and woody country , & c . The theodolite is the most perfect instrument for surveying ; a box sextant will be ...
... intersecting triangles . There are certain cases where a theodo- lite is indispensable - such as a town or village , hilly and woody country , & c . The theodolite is the most perfect instrument for surveying ; a box sextant will be ...
Σελίδα 27
... intersect it will be either too short or too long . The same applies also to plotting the survey on paper ; the straight edge or rule should always be tested by drawing a fine pencil line on the paper , and reversing the edge . Angles ...
... intersect it will be either too short or too long . The same applies also to plotting the survey on paper ; the straight edge or rule should always be tested by drawing a fine pencil line on the paper , and reversing the edge . Angles ...
Σελίδα 31
... intersect the arc at c , and draw the line C c , the parallel line required . Problem 3 . To draw lines parallel to the ... intersecting each other , as at a and b ; draw a line through those points , cutting A B at c , the point of ...
... intersect the arc at c , and draw the line C c , the parallel line required . Problem 3 . To draw lines parallel to the ... intersecting each other , as at a and b ; draw a line through those points , cutting A B at c , the point of ...
Σελίδα 32
... intersecting the same arc at c ; then through c , and the point of intersection at b , draw the perpendicular b c . Problem 7 . Another method to let fall a perpendicular from a given point near the middle of a line , Fig . 7 . From A ...
... intersecting the same arc at c ; then through c , and the point of intersection at b , draw the perpendicular b c . Problem 7 . Another method to let fall a perpendicular from a given point near the middle of a line , Fig . 7 . From A ...
Σελίδα 33
... intersecting at a ; from a , draw the lines a C and a D ; then with the radius of the given length A B from a , set ... intersect the arc at C ; through PRINCIPLES OF GEOMETRY .
... intersecting at a ; from a , draw the lines a C and a D ; then with the radius of the given length A B from a , set ... intersect the arc at C ; through PRINCIPLES OF GEOMETRY .
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66 feet acres adjustment base line calculated centre chain lines chord circle circumference circumferentor co-sine column commence compass cross sections cube yards curve cuttings and embankments datum line decimals describe the arc diameter Diff difference distance Ditto divided division draw the line equal fence field-book fifth column figure fixed flag fore sights frustrum given ground half width height horizontal inches inclosure instrument intersecting land length line A B logarithm manner mark measure method minutes multiply needle number of degrees offsets opposite parallel parallelogram perpendicular Plate 28 plotted poles Problem proof line protractor quantity quotient radius reduced level right angled triangle roads Rule scale screw secant segment shown side A B sine slopes solid content spirit level square links station subtract surface survey surveyor TABLE take the angle tangent points telescope theodolite tie line trapezium vernier vulgar fractions whole
Δημοφιλή αποσπάσματα
Σελίδα 108 - All the interior angles of any rectilineal figure, together with four right angles, are equal to twice as many right angles as the figure has sides.
Σελίδα 70 - To get, then, the quantity of shelled corn in a crib of corn in the ear, measure the length, breadth and height of the crib, inside of the rail; multiply the length by the breadth and the product by the height; then divide the product by two, and you have the number of bushels of shelled corn in the crib.
Σελίδα 29 - Every circumference of a. circle, whether the circle be large or small, is supposed to be divided into 360 equal parts called degrees. Each degree is divided into 60 equal parts called minutes, and each minute into 60 equal parts called seconds.
Σελίδα 60 - PROBLEM V. To find the area of any regular polygon. RULE. Multiply the sum of its sides by a perpendicular drawn from its centre to one of its sides, and take half the product for the area. Or, multiply the square of the side of a polygon (from three to twelve, sides) 'by the numbers in the fourth column of the table for polygons, opposite the number of sides required, and the product will be the area nearly.
Σελίδα 20 - Divide the given number into periods of two figures each, by setting a point over the place of units, another over the place of hundreds, and so on over every second figure, both to the left hand in integers, and to the right hand in decimals. Find the greatest square in the first period on the left hand, and set its root'on the right hand of the given number, after the manner of a quotient figure in Division.
Σελίδα 72 - Cone or Pyramid. Rule: Multiply the circumference of the base by the slant height and half the product is the slant surface; if the surface of the entire figure is required, add the.
Σελίδα 61 - As 7 is to 22, so is the diameter to the circumference; or, as 22 is to 7, so is the circumference to the diameter.
Σελίδα 63 - ... is double that of another, contains four times the area of the other. 4. — The area of a circle is equal to the area of a triangle whose base is equal to the circumference, and perpendicular equal to the radius. 5. — The area of a circle is equal to the rectangle of its radius, and a right line equal to half its circumference. 6. — The area of a circle is to the square of the diameter as .7854 to 1 ; or, multiply half the circumference by half the diameter, and the product will be the area.
Σελίδα 4 - ... and are those which are to be found, at present, in most of the common tables on this subject. The distinguishing mark of this system of logarithms is, that the index or logarithm of 10 is 1 ; that of 100 is 2 ; that of 1000 is 3 ; &c. And, in decimals, the logarithm of •! is — 1 ; that of -01 is — 2 ; that of '001 is — 3, &c.