The Field Engineer: A Handy Book of Practice in the Survey, Location, and Trackwork of Railroads; Containing ... Rules and Tables ... Applicable to ... the Standard and the Narrow Gauge ...D. van Nostrand, 1880 - 318 páginas |
Dentro del libro
Página 40
... telescope , and place a like mark at about the same distance , and level in the opposite direction . Unclamp . Re- volve the instrument horizontally on its spindle half way round , and direct the cross - hair to the point first observed ...
... telescope , and place a like mark at about the same distance , and level in the opposite direction . Unclamp . Re- volve the instrument horizontally on its spindle half way round , and direct the cross - hair to the point first observed ...
Página 41
... telescope downwards , set a pin , or make a pencil dot in line . Unclamp the spindle ; turn the instrument horizontally half- way round ; clamp fast ; fix the cross - hair again on the lower point , and try it on the upper one . If it ...
... telescope downwards , set a pin , or make a pencil dot in line . Unclamp the spindle ; turn the instrument horizontally half- way round ; clamp fast ; fix the cross - hair again on the lower point , and try it on the upper one . If it ...
Página 67
... telescope to the last point fixed on the ini- tial range AB , meas- ure I B , = 503 feet , and set the P. C. at B. Move to B. 4. Suppose the P. C. to have fallen at a stake 2.50 . In order to find the length of the curve , divide the ...
... telescope to the last point fixed on the ini- tial range AB , meas- ure I B , = 503 feet , and set the P. C. at B. Move to B. 4. Suppose the P. C. to have fallen at a stake 2.50 . In order to find the length of the curve , divide the ...
Página 68
... telescope will be directed along the line CD , tangent to the curve at 5 , for the reason that the angle B5C has been made equal to the angle CB5 ( XVI . 4 ) . Proceed with successive deflections of 3 ° 45 ' from this tan- gent , and ...
... telescope will be directed along the line CD , tangent to the curve at 5 , for the reason that the angle B5C has been made equal to the angle CB5 ( XVI . 4 ) . Proceed with successive deflections of 3 ° 45 ' from this tan- gent , and ...
Página 69
... telescope will then be in tangent at 9 . = 12. A simple rule for finding the index angle which shall place the telescope in tangent at any point on the curve is as follows : - From double the index angle which fixed the given point ...
... telescope will then be in tangent at 9 . = 12. A simple rule for finding the index angle which shall place the telescope in tangent at any point on the curve is as follows : - From double the index angle which fixed the given point ...
Otras ediciones - Ver todas
The Field Engineer: A Handy Book of Practice in the Survey, Location and ... William F. Shunk Sin vista previa disponible - 2008 |
The Field Engineer: A Handy Book of Practice in the Survey, Location, and ... William Findlay Shunk Sin vista previa disponible - 2017 |
Términos y frases comunes
100 feet long 100-feet chords adjustment apex distance called central angle column Cosine 1 Sine Cotang cross-hair Cube Roots decimals deflection distance degree of curvature DEGREE OF CURVE Diff divided elevation engineer equal Example feet figure fixed foregoing frog angle Full Gauge gauge of track gauge side gent ground index angle instrument intersection angle length of switch-rail located logarithm M.
M. I Sine Main frog dist mantissa mark measure method middle frog middle ordinate middle point minutes Multiply observation outer rail parallel perpendicular quotient radii radius range Reciprocals REVERSED CURVE right triangle screws slope Square Roots standard gauge straight line sub-chord subtended Subtract Suppose Table XVI tabular tance Tang tangent A B tangential angle tangential distance telescope terminal tangent tion toe of switch Trigonometry turnout curve vernier versin vertical ΙΟ ΤΑΝ
Pasajes populares
Página 18 - ... the square of the hypothenuse is equal to the sum of the squares of the other two sides.
Página 4 - The logarithm of any power of a number is equal to the logarithm of the number multiplied by the exponent of the power.
Página 11 - ... is supposed to be divided into 60 equal parts, called minutes; and each minute into 60 equal parts, called seconds. Degrees, minutes, and seconds, are designated respectively, by the characters ° ' ". For example, ten degrees, eighteen minutes, and fourteen seconds, would be written 10° 18
Página 4 - The logarithm of the product of two numbers is equal to the sum of the logarithms of the numbers. log» MN = log» M + log