Elements of Surveying: With a Description of the Instruments and the Necessary Tables, Including a Table of Natural SinesA.S. Barnes, 1839 - 261 páginas |
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Página 22
... inches in length , two inches wide , and a fifth of an inch in thick- ness . It should be made of a hard material , perfectly straight and smooth . The hypothenuse of the right - angled triangle , which is length , and it is most ...
... inches in length , two inches wide , and a fifth of an inch in thick- ness . It should be made of a hard material , perfectly straight and smooth . The hypothenuse of the right - angled triangle , which is length , and it is most ...
Página 23
... inch , be divided into any number of equal parts , as 10 , the scale thus 2 12 .5.6.7.8.9 10 ab , which is divided , ormed , is called a scale of ten parts to the inch . The line DESCRIPTION OF INSTRUMENTS . 23 Scale of Equal Parts ...
... inch , be divided into any number of equal parts , as 10 , the scale thus 2 12 .5.6.7.8.9 10 ab , which is divided , ormed , is called a scale of ten parts to the inch . The line DESCRIPTION OF INSTRUMENTS . 23 Scale of Equal Parts ...
Página 24
... inch . If , for example , ab the unit of the scale , were half an inch , the scale would be one of 10 parts to half an inch , or of 20 parts to the inch . If it were required to take from the scale a line equal to two inches and six ...
... inch . If , for example , ab the unit of the scale , were half an inch , the scale would be one of 10 parts to half an inch , or of 20 parts to the inch . If it were required to take from the scale a line equal to two inches and six ...
Página 28
... inch on the paper , or by any part of an inch , take the inch , or part of the inch from the scale of inches on the sector : then , placing one foot of the dividers at 40 on one arm of the sector , open the sector until the other foot ...
... inch on the paper , or by any part of an inch , take the inch , or part of the inch from the scale of inches on the sector : then , placing one foot of the dividers at 40 on one arm of the sector , open the sector until the other foot ...
Página 30
... the unit of the scale . 33. Suppose that the given line were 75 feet in length , and it were required to draw it on paper , on a scale of 25 feet to The length of the line 75 feet , being divided the inch . 30 INTRODUCTION .
... the unit of the scale . 33. Suppose that the given line were 75 feet in length , and it were required to draw it on paper , on a scale of 25 feet to The length of the line 75 feet , being divided the inch . 30 INTRODUCTION .
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Términos y frases comunes
adjusted angle of elevation axis azimuth back-sights base line called centre clamp-screw coincide column comp compass Cosine D Cosine Sine Cotang course curve decimal degrees determined difference of level direction divided double meridian distance draw east elongation error example feet field notes figure given angle given line given point ground Gunter's chain hence horizontal angle horizontal distance horizontal plane hypothenuse inches instrument intersection LatDegDegDegDeg Distance latitude and departure length line AC line of collimation logarithm M.
M. Sine marked measure multiplied natural sines object opposite station paper parallel passing perpendicular plane of reference protractor radius right angles right-angled triangle rods scale of equal secant side sights similar triangles Sine Sine spider's lines square chains staff subtract surface survey Tang tangent theodolite true meridian vernier plate vertical limb yards
Pasajes populares
Página 12 - FRACTION is a negative number, and is one more than the number of ciphers between the decimal point and the first significant Jigure.
Página 41 - In any triangle, the sum of the two sides containing either angle, is to their difference, as the tangent of half the sum of the two other angles, to the tangent of half their difference.
Página 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.
Página 113 - B, from B to C, from C to D, from D to E, and from E to A ; and measure the distances AB, BC, CD, DE, and E.1.
Página 19 - ... perimeter of the polygon. 14. The polygon of three sides, the simplest of all, is called a triangle; that of four sides, a quadrilateral; that of...
Página 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.
Página 21 - If equals be added to equals, the wholes will be equal. 3. If equals be taken, from equals, the remainders will be equal. 4. If equals be added to unequals, the wholes will be unequal.
Página 20 - And lastly, the trapezoid, only two of whose sides are parallel. 18. A diagonal is a line which joins the vertices of two angles not adjacent to each other. Thus, AF, AE, AD, AC, are diagonals.
Página 11 - 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.
Página 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.