Elements of Surveying and Leveling: With Descriptions of the Instruments, and the Necessary Tables |
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Page 80
... sights mark some distinct object ; then look through the other sights , and place a staff on the line which they indicate : let the cross be then turned until the sights of the bar AB come to this last line : if the other sights are ...
... sights mark some distinct object ; then look through the other sights , and place a staff on the line which they indicate : let the cross be then turned until the sights of the bar AB come to this last line : if the other sights are ...
Page 83
... sight from C , O A B CP make the angle BCP equal to 120 ° , and resume the survey of the line . AC is equal to AB or BC . NOTE . This method may be employed in the absence of any angular instruments , by constructing an equilateral ...
... sight from C , O A B CP make the angle BCP equal to 120 ° , and resume the survey of the line . AC is equal to AB or BC . NOTE . This method may be employed in the absence of any angular instruments , by constructing an equilateral ...
Page 84
... sight to the E B object D , and let the point , at which the line AD cuts the staff BE , be marked . Measure the distance BE on the staff ; then , AB : BE :: AC : CD , whence CD becomes known . If the line AC cannot be measured , on ...
... sight to the E B object D , and let the point , at which the line AD cuts the staff BE , be marked . Measure the distance BE on the staff ; then , AB : BE :: AC : CD , whence CD becomes known . If the line AC cannot be measured , on ...
Page 109
... sight , or reverse bearing . 69. The perpendicular distance between the east and west lines , drawn through the extremities of a course , is called the northing or southing , according as the course is run towards the north or south ...
... sight , or reverse bearing . 69. The perpendicular distance between the east and west lines , drawn through the extremities of a course , is called the northing or southing , according as the course is run towards the north or south ...
Page 110
... sights , AF and BG , are placed at right angles to the plate AB , and fastened to it firmly by the screws a and b . In each sight there is a large and small aperture or slit ; the larger aperture being above the smaller in one of the sights ...
... sights , AF and BG , are placed at right angles to the plate AB , and fastened to it firmly by the screws a and b . In each sight there is a large and small aperture or slit ; the larger aperture being above the smaller in one of the sights ...
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Common terms and phrases
adjusted Applying logarithms axis azimuth back-sight base-line bearing chord clamp-screw column compass corresponding Cosine Cosine D course curve decimal DegDeg degree of curvature degrees determined difference of level divided double meridian distance draw east error example feet field-notes fore-sight given angle given line ground hence horizontal angles horizontal distance horizontal plane inch intersection LatDeg LatDegDeg LatDegDegDegDeg latitude and departure length limb line of collimation locating M.
M. Sine M.
M. Sine D mantissa marked measured method multiplied NOTE offsets parallel passed perpendicular plane of reference plot position prismoid protractor radius reading right angles scale of equal screws secant side sights similar triangles Sine Cotang slope spider's lines stakes station subtract surface survey taken Tang tangent theodolite traverse vernier plate vertical plane yards
Popular passages
Page 56 - ... the square of the hypothenuse is equal to the sum of the squares of the other two sides.
Page 12 - The logarithm of any power of a number is equal to the logarithm of the number multiplied by the exponent of the power.
Page 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.
Page 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.
Page 12 - The logarithm of a quotient is equal to the logarithm of the dividend minus the logarithm of the divisor.
Page 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...
Page 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.
Page 11 - The logarithm of the product of two numbers is equal to the sum of the logarithms of the numbers.
Page 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.
Page 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.