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 |
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Página 23
... screws on the outside of the telescope - barrel , should be in the direction which would seem to increase the error requiring correction . 3. Before beginning the adjustments , screw the object - glass close home , and make a pin ...
... screws on the outside of the telescope - barrel , should be in the direction which would seem to increase the error requiring correction . 3. Before beginning the adjustments , screw the object - glass close home , and make a pin ...
Página 24
... screws at right angles to it on the telescope - barrel . Bring the spider - line again to coincide with the object by means of the levelling and tangent screws , and , if necessary , repeat the operation . Proceed in the same man- ner ...
... screws at right angles to it on the telescope - barrel . Bring the spider - line again to coincide with the object by means of the levelling and tangent screws , and , if necessary , repeat the operation . Proceed in the same man- ner ...
Página 25
... screws securing the inner end of the eye - piece . TO BRING THE LEVEL BUBBLE PARALLEL WITH THE TELE- SCOPE AXIS . 5. Clamp the instrument over either pair of levelling screws , and bring the bubble to the middle of its tube . Turn the ...
... screws securing the inner end of the eye - piece . TO BRING THE LEVEL BUBBLE PARALLEL WITH THE TELE- SCOPE AXIS . 5. Clamp the instrument over either pair of levelling screws , and bring the bubble to the middle of its tube . Turn the ...
Página 26
... screws of the diaphragm , and correct the error by turning it . Try again the adjustment of the line of collimation before pinning up the wyes . XI . LEVELLING . 1. Suppose O the starting - point ; 1 , 2 , 3 , & c . , the stakes of ...
... screws of the diaphragm , and correct the error by turning it . Try again the adjustment of the line of collimation before pinning up the wyes . XI . LEVELLING . 1. Suppose O the starting - point ; 1 , 2 , 3 , & c . , the stakes of ...
Página 28
... screws : the screws had a tendency to work loose in the field , and cause the parts to chafe or jam . These rods are clearly figured , so as to be legible at a distance of several hundred feet ; the leveller is thus enabled to take ...
... screws : the screws had a tendency to work loose in the field , and cause the parts to chafe or jam . These rods are clearly figured , so as to be legible at a distance of several hundred feet ; the leveller is thus enabled to take ...
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