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, and Prepared with Special Reference to the Wants of the Young EngineerD. Van Nostrand Company, 1890 - 339 páginas |
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Página 14
... diff . • 2.47 No. of seconds , 28 Product 69.16 to be added . · Log . sine 40 ° 26 ' 28 " 9.811952 69 9.812021 5. If the arc is greater than 90 ° , find the required function of its supplement . Thus the logarithmic tangent of 118 ° 18 ...
... diff . • 2.47 No. of seconds , 28 Product 69.16 to be added . · Log . sine 40 ° 26 ' 28 " 9.811952 69 9.812021 5. If the arc is greater than 90 ° , find the required function of its supplement . Thus the logarithmic tangent of 118 ° 18 ...
Página 29
... Diff . -1.088595 And 0.1226 X 55000 = 6743 , the required difference of elevation in feet . 11. A closer approximation is thought to be attainable by using a thermometer in connection with the mercurial barome- ter . In that case ...
... Diff . -1.088595 And 0.1226 X 55000 = 6743 , the required difference of elevation in feet . 11. A closer approximation is thought to be attainable by using a thermometer in connection with the mercurial barome- ter . In that case ...
Página 75
... Diff . 2.477121 • 9.977711 12.454832 9.954274 2.500558 If E is invisible from B , extend the line DB towards C , until a line CE clears the obstacle . The point E must then be established by intersection of the sides CE , DE , in ...
... Diff . 2.477121 • 9.977711 12.454832 9.954274 2.500558 If E is invisible from B , extend the line DB towards C , until a line CE clears the obstacle . The point E must then be established by intersection of the sides CE , DE , in ...
Página 76
... Diff .. • 2.274850 0.140334 • 2.415184 2.814048 9.601136 The angle at C , being evidently the lesser of the two angles at the base , is equal to the half sum of these angles decreased by their half difference , = 54 ° 06 / 21 ° 45 ...
... Diff .. • 2.274850 0.140334 • 2.415184 2.814048 9.601136 The angle at C , being evidently the lesser of the two angles at the base , is equal to the half sum of these angles decreased by their half difference , = 54 ° 06 / 21 ° 45 ...
Página 105
... diff . of segments of E G , 804 . Adding half the difference to half the sum of the segments of the base EG , we shall have the greater of them ; i.e. , ( 3,343 +804 ) ÷ 2 = 2,073.5 , which is the cos . E , E F being radius . Hence ...
... diff . of segments of E G , 804 . Adding half the difference to half the sum of the segments of the base EG , we shall have the greater of them ; i.e. , ( 3,343 +804 ) ÷ 2 = 2,073.5 , which is the cos . E , E F being radius . Hence ...
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A. D. MIN adjustment apex distance backsight called central angle CHORD column Cosine 1 Sine cross-hair Cube Roots decimal deflection distance degree of curvature degree of curve Diff divided engineer equal error Example feet figure fixed FOOD foregoing formation slope frog angle gauge of track gauge side ground Hence inches index angle instrument height intersection angle located logarithm Main frog dist mantissa mark measure method metres metric curve middle frog middle ordinate middle point 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 transitman Trigonometry turnout curve vernier vertical ΙΟ