Elements of Surveying and Leveling: With Descriptions of the Instruments, and the Necessary TablesA.S.Barnes, 1871 - 161 páginas |
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Página 25
... 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 - tenths , place one foot of the dividers at 2 , on the left ...
... 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 - tenths , place one foot of the dividers at 2 , on the left ...
Página 29
... half de- grees . The degrees are numbered from 0 to 180 , both ways ; that is , from A to B and from B to A. The divisions , in the figure , are made only to degrees . There is a small notch at the middle of the diameter AB , which ...
... half de- grees . The degrees are numbered from 0 to 180 , both ways ; that is , from A to B and from B to A. The divisions , in the figure , are made only to degrees . There is a small notch at the middle of the diameter AB , which ...
Página 34
... half an inch ) , how many parts are to be taken ? Ans . { 5.25 parts , or 2.625 inches . 3. A line of 384 feet is drawn on paper , on a scale of 45 feet to the inch ; what is its length on the paper ? Ans . 8.53 inches . NOTE . When the ...
... half an inch ) , how many parts are to be taken ? Ans . { 5.25 parts , or 2.625 inches . 3. A line of 384 feet is drawn on paper , on a scale of 45 feet to the inch ; what is its length on the paper ? Ans . 8.53 inches . NOTE . When the ...
Página 44
... half the sum of the two other angles , to the tangent of half their difference . 64. Let ACB be a triangle : then will AB 44 [ BOOK I. ELEMENTS OF SURVEYING .
... half the sum of the two other angles , to the tangent of half their difference . 64. Let ACB be a triangle : then will AB 44 [ BOOK I. ELEMENTS OF SURVEYING .
Página 45
... half the angle CAE at the centre ( Bk . III . , Prop . XVIII . ) ; that is , half the sum of the angles C and B , or equal to ( C + B ) . = The angle AFC ACB , is also equal to ABC + BAF ; therefore , BAF ACB - ABC . = But , ICF = ( BAF ) ...
... half the angle CAE at the centre ( Bk . III . , Prop . XVIII . ) ; that is , half the sum of the angles C and B , or equal to ( C + B ) . = The angle AFC ACB , is also equal to ABC + BAF ; therefore , BAF ACB - ABC . = But , ICF = ( BAF ) ...
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Términos y frases comunes
Applying logarithms axis azimuth back-sight base-line bearing chord clamp-screw column compass contour lines corresponding Cosine Cosine D Cotang course curve decimal degree of curvature degrees determined difference of level divided double meridian distance draw drawn east error example feet field-notes fore-sight given angle given line given point ground height of instrument hence horizontal angles horizontal distance horizontal plane inch intersection latitude and departure length limb line of collimation M.
M. Sine mantissa marked measured method multiplied notes offsets paper parallel passing perpendicular plane of reference plot position prismoid protractor radius reading right angles scale of equal screws secant side sights Sine D slope spider's lines stakes station subtract surface survey taken Tang tangent theodolite traverse vernier plate vertical plane wwwwwwwww yards
Pasajes populares
Página 56 - ... the square of the hypothenuse is equal to the sum of the squares of the other two sides.
Página 12 - The logarithm of any power of a number is equal to the logarithm of the number multiplied by the exponent of the power.
Página 17 - 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 37 - 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, etc.
Página 12 - The logarithm of a quotient is equal to the logarithm of the dividend minus the logarithm of the divisor.
Página 10 - When a number lies between 1 and 10, its logarithm lies between 0 and 1; that is, it is equal to 0, plus a decimal; if a number lies between 10...
Página 9 - The logarithm of a number is the exponent of the power to which it is necessary to raise a fixed number, in order to produce the first number.
Página 11 - The logarithm of the product of two numbers is equal to the sum of the logarithms of the numbers.
Página 130 - MC; hence, the double meridian distance of a course is equal to the double meridian distance of the preceding course, plus the departure of that course, plus the departure of the course itself : if .there is no preceding course, the first two terms become zero.
Página 38 - 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, 00 is the secant of the arc AB.