The Field Engineer: A Handy Book of Practice in the Survey, Location, and Track-work of Railroads; Containing a Large Collection of Rules and Tables, Original and Selected, Applicable to Both the Standard and the Narrow Gauge ...D. Van Nostrand Company, 1890 - 339 páginas |
Dentro del libro
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 B5 C 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 B5 C 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 ...
Página 73
... telescope will be in line CE . Make CE 200 feet . Move to E. See that vernier still reads 10 ° right . BS to C , and turn 10 ° left . Ver- nier will now read zero , and telescope will be in line EG , or tangent A B prolonged . = - 2 ...
... telescope will be in line CE . Make CE 200 feet . Move to E. See that vernier still reads 10 ° right . BS to C , and turn 10 ° left . Ver- nier will now read zero , and telescope will be in line EG , or tangent A B prolonged . = - 2 ...
Términos y frases comunes
A. D. MIN adjustment apex distance backsight called capstan central angle chord A C column Cosine 1 Sine cross-hair Cube Roots decimal deflection distance degree of curvature degree of curve divided engineer equal error Example feet figure fixed foregoing formation slope frog angle gauge of track gauge side ground Hence inches index angle instrument height intersection angle located logarithm M.
M. Sine Main frog dist mantissa mark measure method metres middle ordinate minutes multiplied natural sine number corresponding observation opposite outer rail parallel perpendicular plane triangle Polaris quotient radii radius range REVERSED CURVE rule Sine 1 Cotang Square Roots sub-chord subtended Subtract Suppose switch-rail Table XVI tabular tance Tang tangential angle tangential distance telescope terminal tangent tion toe of switch Trigonometry turnout curve vernier vertical ΙΟ
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 - Every circumference of a. circle, whether the circle be large or small, is supposed to be divided into 360 equal parts called degrees. Each degree is divided into 60 equal parts called minutes, and each minute into 60 equal parts called seconds.
Página 11 - ... 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. The operation of finding the unknown parts is called the solution of the triangle.
Página 19 - Call the word written upon each side the name of each side ; then say, As the name of the given side, Is to the given side ; So is the name of the required side, To the required side.
Página 3 - THE LOGARITHM: of a number is the exponent of the power to which it is necessary to raise a fixed number, to produce the given number.
Página 195 - 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.
Página i - SHUNK, WF The Field Engineer. A Handy Book of practice in the Survey, Location and Track-work of Railroads, containing a large collection of Rules and Tables, original and selected, applicable to both the Standard and Narrow Gauge, and prepared with special reference to the wants of the young.
Página 19 - To find an angle. Assume one side to be radius, and mark the remaining sides as before. Then say, As the side made radius is to radius, So is the other given side to the name of that side; Which determines the opposite angle.
Página 13 - If the angle is greater than 45°, look for the degrees at the bottom of the page, and for the minutes in the right-hand column ; then follow the corresponding...