Elements of Surveying, and Navigation: With a Description of the Instruments and the Necessary Tables |
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Page 18
... curve , a curved line . 5. A surface is that which has length and breadth , without height or thickness . 6. A plane is a surface , in which , if two points be assumed at pleasure , and connected by a straight line , that line will lie ...
... curve , a curved line . 5. A surface is that which has length and breadth , without height or thickness . 6. A plane is a surface , in which , if two points be assumed at pleasure , and connected by a straight line , that line will lie ...
Page 87
... curve edca . d a b C A B At A and E , the extremities of the right line AE , erect the two perpen- diculars Aa , Ee , and on each of them measure the breadth of the land . Then divide the base into any convenient number of equal parts ...
... curve edca . d a b C A B At A and E , the extremities of the right line AE , erect the two perpen- diculars Aa , Ee , and on each of them measure the breadth of the land . Then divide the base into any convenient number of equal parts ...
Page 89
... curve of the ellipse . REMARK II . In determining the content of ground , in the examples which have been given , the linear dimen- sions have been taken in chains and decimals of a chain . If the linear dimensions were taken in terms ...
... curve of the ellipse . REMARK II . In determining the content of ground , in the examples which have been given , the linear dimen- sions have been taken in chains and decimals of a chain . If the linear dimensions were taken in terms ...
Page 149
... curves are more or less numerous , the form of the surface will be more or less accurately ascertained . If such a system of curves be determined , and then pro- jected or let fall on a horizontal plane , it is obvious that the curves ...
... curves are more or less numerous , the form of the surface will be more or less accurately ascertained . If such a system of curves be determined , and then pro- jected or let fall on a horizontal plane , it is obvious that the curves ...
Page 151
... curves of section on paper . Having drawn on the paper the line AB , lay off the angle BAC - 25 ° , and the angle BAD ... curve are thus found . By the aid of the sector , the graphic operations are greatly facilitated . Let it be borne ...
... curves of section on paper . Having drawn on the paper the line AB , lay off the angle BAC - 25 ° , and the angle BAD ... curve are thus found . By the aid of the sector , the graphic operations are greatly facilitated . Let it be borne ...
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Elements of Surveying, and Navigation: With a Description of the Instruments ... Charles Davies No preview available - 2016 |
Elements of Surveying, and Navigation: With a Description of the Instruments ... Charles Davies No preview available - 2016 |
Common terms and phrases
axis azimuth back-sights base line bearing called centre clamp-screw coincide column comp compass corresponding course curve decimal degrees determined diff difference of latitude difference of level difference of longitude direction divided double meridian distance draw east error example extremity feet field notes figure given line given point ground half hence horizontal distance horizontal plane hypothenuse inches instrument intersection LatDegDegDegDeg Distance latitude and departure length line of collimation logarithm marked measure method middle latitude miles multiplied needle opposite station paper parallel Parallel Sailing parture passing perpendicular plane of reference Plane Sailing plane triangle protractor radius right angles right-angled triangle sails scale of equal secant ship side sights similar triangles spider's lines square chains staff subtract surface survey tance Tang tangent theodolite Trigonometry vernier plate yards
Popular passages
Page 49 - ... the square of the hypothenuse is equal to the sum of the squares of the other two sides.
Page 41 - 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.
Page 73 - Being on a horizontal plane, and wanting to ascertain the height of a tower, standing on the top of an inaccessible hill, there were measured, the angle of elevation of the top of the hill 40°, and of the top of the tower 51° ; then measuring in a direct line 180 feet farther from the hill, the angle of elevation of the top of the tower Cway 33° 45' ; required the height of the tower.
Page 34 - The circumference of every circle is supposed to be divided into 360 equal parts, called degrees ; each degree into 60 equal parts, called minutes ; and each minute into 60 equal parts, called seconds.
Page 35 - The secant of an arc is the line drawn from the centre of the circle through one extremity of the arc, and limited by the tangent passing through the other extremity. Thus, OC is the secant of the arc AB.
Page 19 - NB The minutes in the left-hand column of each page, increasing downwards, belong to the degrees at the top ; and those increasing upwards, in the right.hand column, belong to the degrees below.
Page 19 - Two lines are said to be parallel, when being situated in the same plane, they cannot meet, how far soever, either way, both of them be produced. 13. A plane figure is a plane terminated on all sides by lines, either straight or curved. If the lines are straight, the space they enclose is called a rectilineal figure, or polygon, and the lines themselves, taken together, form the contour, or perimeter of the polygon. 14. The polygon of three sides, the simplest of all, is called a triangle; that of...
Page 132 - The line so determined makes, with the true meridian, an angle equal to the azimuth of the polestar; and from this line the variation of the needle is readily determined, even without tracing the true meridian on the ground. Place the compass upon this line, turn the sights in the direction of it, and note the angle shown by the needle. Now, if the elongation, at the time of observation, was west, and the north end of the needle is on the west side of the line, the azimuth, plus the angle shown by...
Page 34 - Mathematics which treats of the solution of plane triangles. In every plane triangle there are six parts : three sides and three angles. When three of these parts are given, one being a side, the remaining parts may be found by computation.
Page 21 - AXIOM is a self-evident truth ; such as, — 1. Things which are equal to the same thing, are equal to each other. 2. If equals be added to equals, the sums will be equal. 3. If equals be taken from equals, the remainders will be equal. 4. If equals be added to unequals, the sums will be unequal. 5. If equals be taken from unequals, the remainders will be unequal. 6. Things which are double...