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 xi
... telescope • 24 To bring the level bubble parallel with the tele- scope axis To adjust the wyes ; or , in other words , to bring the telescope into a position at right angles to the vertical axis of the instrument XI . Levelling ...
... telescope • 24 To bring the level bubble parallel with the tele- scope axis To adjust the wyes ; or , in other words , to bring the telescope into a position at right angles to the vertical axis of the instrument XI . Levelling ...
Página 23
... 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 - scratch across its rim and 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 - scratch across its rim and the ...
Página 24
... telescope half - way around in the wyes . If the cross - hair selected for treatment then fails to coincide with the object , reduce the error one - half by means of the small capstan head screws at right angles to it on the telescope ...
... telescope half - way around in the wyes . If the cross - hair selected for treatment then fails to coincide with the object , reduce the error one - half by means of the small capstan head screws at right angles to it on the telescope ...
Página 25
... telescope to its first position , level up again , and repeat the operation until the erroneous movement ceases . This adjustment brings the telescope and level into the same vertical plane . 6. Next , the bubble being at the middle of ...
... telescope to its first position , level up again , and repeat the operation until the erroneous movement ceases . This adjustment brings the telescope and level into the same vertical plane . 6. Next , the bubble being at the middle of ...
Página 26
... telescope and its bubble - case as nearly vertical in the wye bearings as hand and eye can make them , and by reference to a plumb - line , or the corner of a well - built house , see if the vertical hair is out of true . If so ...
... telescope and its bubble - case as nearly vertical in the wye bearings as hand and eye can make them , and by reference to a plumb - line , or the corner of a well - built house , see if the vertical hair is out of true . If so ...
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