Elementary text book for young surveyors and levellersSimpkin, Marshall & Company, 1856 - 185 Seiten |
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Seite vii
... taken into conside- ration . The field application of the principles of surveying must inevitably tend , by the use of the various instru- ments alone , to give a tone to the mind , and encourage a fondness for science , at the same ...
... taken into conside- ration . The field application of the principles of surveying must inevitably tend , by the use of the various instru- ments alone , to give a tone to the mind , and encourage a fondness for science , at the same ...
Seite 1
... taken either from left to right , or from right to left , as the case may require ; but as it is divided only to degrees , the minutes must be guessed at . Now to lay off the given angle of 60 degrees from the line AB , look for 60 ...
... taken either from left to right , or from right to left , as the case may require ; but as it is divided only to degrees , the minutes must be guessed at . Now to lay off the given angle of 60 degrees from the line AB , look for 60 ...
Seite 2
... taken in the same way - thus , the angle BAE would be an angle of 90 degrees , called a quadrant or right angle . There is a larger protractor furnished with a vernier , but it is an expensive instrument , and is not necessary , except ...
... taken in the same way - thus , the angle BAE would be an angle of 90 degrees , called a quadrant or right angle . There is a larger protractor furnished with a vernier , but it is an expensive instrument , and is not necessary , except ...
Seite 11
... taken upon any scale of equal parts . 11. To describe a square on a given line AB . From the point A erect a per- pendicular to AB ; make AC equal to AB ; and through the point C draw CD parallel to AR ; make CD equal to AB , and join ...
... taken upon any scale of equal parts . 11. To describe a square on a given line AB . From the point A erect a per- pendicular to AB ; make AC equal to AB ; and through the point C draw CD parallel to AR ; make CD equal to AB , and join ...
Seite 31
... should also enter each tally in his book . In this manner they continue , till the whole line is measured . Should it not be a complete chain to the end , and no offsets required to be taken , it is ON THE CHAIN . 31.
... should also enter each tally in his book . In this manner they continue , till the whole line is measured . Should it not be a complete chain to the end , and no offsets required to be taken , it is ON THE CHAIN . 31.
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Elementary Text Book for Young Surveyors and Levellers with Copious Field ... Henry James Castle Keine Leseprobe verfügbar - 2019 |
Elementary Text Book for Young Surveyors and Levellers With Copious Field ... Henry James Castle Keine Leseprobe verfügbar - 2019 |
Häufige Begriffe und Wortgruppen
2nd gate A. R. P. Answer angle of bearing angle of elevation base line bisect broad arrow centre chain surveying chains 50 links CHAP CHECK ANGLES check line circle circumferentor clamp corner correct cross customary determined diagonal DIAGRAM distance ditch divided draw equal Euclid EXAMPLE fence field book field notes flag gate post given angle given line given point half degrees hedge height horizontal inch interior angles intersection join Lancashire length line AC long scale mark meridian line motion needle number of degrees object observation offsets perpendicular placed plot pond protractor Required the true right angles right-angled triangle river road roods round screws similar triangles spirit level square chains square feet statute acres statute measure taken telescope theodolite top of bank trapezium triangle ABC true bearing true north vertical whole instrument width Wiltshire Wood
Beliebte Passagen
Seite 111 - 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.
Seite 160 - LEVELLING is the art of representing the inequalities of the earth's surface, and of determining the relative heights of any number of points above or below a line, equidistant, at every point, from the centre of the earth.
Seite 17 - The square of the hypothenuse is equal to the sum of the squares of the other two sides ; as, 5033 402+302.
Seite 8 - To describe a square upon a given straight line. Let AB be the given straight line : it is required to describe a square upon AB.
Seite 102 - The existence of parallax is determined by moving the eye about, when looking through the telescope, observing whether the cross wires change their position, and are flittering and undefined. To correct this error, first adjust the eye-piece, by means of the moveable eye-piece tube, till you can perceive the cross wire clearly defined, and sharply marked against any white object.
Seite 23 - C will be found 9, the square root on D. For the square root of 144 : Set 1 on C to 10 on D ; then against 144 on C will be found the square root 12 on D. 42. To find the area of a board or plank : The rule is, to multiply the length by the breadth, the product will be the area ; therefore, by the sliding rule, Set 12 on B against the breadth in inches on A ; then...
Seite 16 - E, the adjacent angles CEA, AED; these angles are together equal to two right angles. (i. 13.) Again, because the straight line DE makes with AB...
Seite 28 - To find the area of a circle. Rule — Multiply the square of the diameter by .7854; or the square of the radius by 3.1416; or the square of the circumference by .07958. Find the area of a piston 20 in. in diam. Answer— 20!
Seite 8 - To draw a straight line at right angles to a given straight line, from a given point in the same. Let AB be the given straight line, and C the given point in it : it is required to draw from the point C a straight line at right angles to AB.
Seite 23 - To find the Area of a Triangle when the Three Sides are given. Rule. — From half the sum of the three sides subtract each side separately. Multiply the half sum and the three remainders together, and extract the square root of the product.