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TABLE II. -'Radii, Ordinates and Deflections. Chord =100 ft. CURVE FORMULAS <br />. <br />Deg. <br />Radius . <br />Mid. <br />Ord. <br />Tan. <br />Dist. <br />Def. <br />Dist. <br />Def. <br />1for <br />Deg. <br />Radius <br />Mid. <br />Ord. <br />Tan <br />Dist. <br />Def. <br />Dist. <br />Def. <br />1 for <br />51' <br />'ft. <br />-1t. <br />t. <br />ft. <br />/ <br />43' <br />ft. <br />ft." <br />ft. <br />ft. <br />' <br />0'10' <br />$437.7. <br />.036 <br />.145 <br />.291 <br />0.05 <br />7. <br />819.0 <br />1.528 <br />6.105 <br />12.21 <br />2.10 <br />20 <br />17189.: <br />.073 <br />.291' <br />.552 <br />0.10 <br />20' <br />781.8 <br />1.600 <br />6.395 <br />12.79 <br />2.20 <br />30 <br />.11459. <br />.109 <br />.436' <br />.873 <br />0.15 <br />30 <br />764.5 <br />1.637 <br />6.540 <br />13.08 <br />2.25 <br />40 <br />8594.4 <br />.145 <br />.582 <br />•1.164 <br />0.20 <br />.' 40 <br />747.9 <br />1.673 <br />6.685 <br />13.37 <br />2.30 <br />50' <br />6875.5 <br />.182 <br />.727 <br />1.454 <br />0.25 <br />6, <br />716.8 <br />1.746 <br />6.976 <br />13.95 <br />2.40 <br />1 <br />5729.6 <br />.218 <br />.873 <br />1.745 <br />0.30% <br />20 <br />688.2 <br />1.819 <br />7.266 <br />14.53 <br />2.60 <br />10 <br />4911.2 <br />,255 <br />1.018 <br />2.036 <br />0.35 <br />30 <br />674.7 <br />1.855 <br />7.411 <br />14.82 <br />2.55 <br />20 <br />4297.3 <br />.291 <br />1.164' <br />.2.327 <br />0.40 <br />- 40 <br />661.7 <br />1.892 <br />7.556 <br />15.11 <br />2.60 <br />-30 <br />3819,8 <br />.327 <br />1.309 <br />2.618 <br />0.45 <br />9 <br />637.3 <br />1.965 <br />7.846 <br />15.69 <br />2.70 <br />40 <br />: 3437.9 <br />.364 <br />1.454 <br />2.909 <br />0.50 <br />20. <br />614.6 <br />2.037 <br />8:136 <br />16.27 <br />2.80 <br />50 <br />3125:4 <br />:.400 <br />1.600 <br />3.200 <br />0.55 <br />'30 <br />603.8 <br />2.074 <br />8.281 <br />16.56 <br />2.85 <br />2 <br />2864.9 <br />.436 <br />1.745 <br />3.490 <br />0.60. <br />i 40 <br />593.4 <br />2.110 <br />8.426 <br />16.85 <br />2.90 <br />10 <br />2644•.6 <br />.473 <br />1.891 <br />3.781 <br />0.65 <br />10, <br />573.7 <br />2.183, <br />8.716 <br />17.43 <br />3.00 <br />20 <br />2455.7 <br />.509 <br />2.036 <br />4.072 <br />0.70 <br />30` <br />546.4 <br />2:292 <br />9.150 <br />18.30 <br />3.15 <br />30 <br />2292.0 <br />.545 <br />2.181' <br />4.363 <br />0.75 <br />11 <br />521.7 <br />2.402 <br />9.585 <br />19.16 <br />3.30 <br />40 <br />. 2148.8 <br />.582 <br />2:327 <br />4.654 <br />0.80. <br />30 <br />499:1 <br />2.511 <br />10:02 <br />20:04 <br />3.45 <br />50 <br />2022:4 <br />.618 <br />2.472 <br />4.945 <br />0.85. <br />12' <br />478.3 <br />2.620 <br />10.45 <br />20.91 <br />3.60 <br />9, <br />1910.1 <br />.655 <br />2.618 <br />5.235 <br />0.90 <br />30. <br />459.3 <br />2.730 <br />10.89 <br />21.77 <br />3.75 <br />10 <br />1809.6 <br />.691.2.763 <br />5.526 <br />0.95 • <br />13 <br />441.7 <br />2.839 <br />11.32 <br />22.64 <br />3.90 <br />20 <br />1719.1 <br />.727 <br />2.908 <br />5.817.1.00 <br />30 <br />425.4 <br />2.949: <br />11.75 <br />23.51 <br />4.05 <br />36 <br />1637.3 <br />.764.3.054 <br />6.108 <br />1.05, <br />14 <br />410.3 <br />3.058 <br />12.18. <br />24.37 <br />4.20 <br />40 <br />'1562.9 <br />.800 <br />3.199 <br />6.398 <br />1.10 <br />30 <br />396.2 <br />3.168 <br />12.62 <br />25.24 <br />4.35 <br />50 <br />1495.0 <br />.836 <br />3.345 <br />6.689 <br />1.15 <br />15 <br />383.1 <br />3.277 <br />13.05 <br />26.11 <br />4.50 <br />1432.7 <br />.873 <br />3.490 <br />6.980 <br />1.20' <br />30 <br />370.8 <br />3.387 <br />13.49 <br />26.97 <br />4.65 <br />10 <br />1375.4 <br />.909 <br />3.635 <br />7.271 <br />1.25• <br />16/ <br />359.3 <br />3.496 <br />13.92 <br />27.84 <br />4.80 <br />20 <br />1322.5 <br />.945 <br />3.718 <br />7.561 <br />1.30 <br />-'; 30 <br />348.5 <br />3.606 <br />14.35 <br />28.70 <br />4.95 <br />30 <br />1273.6 <br />.982 <br />3.926 <br />7.852 <br />1.35 <br />17 <br />338.3 <br />3.716 <br />14.78 <br />29.56 <br />5.10 <br />40 <br />1228.1 <br />1.018 <br />4.071 <br />8.143 <br />1.40 <br />1S <br />319.6 <br />3.935 <br />15.64 <br />31.29 <br />5.40 <br />50 <br />1185.8 <br />1.055 <br />4.217 <br />8.433 <br />1.45 <br />'19 <br />302.9 <br />4.155 <br />16.51 <br />33.01 <br />5.70 <br />5 <br />1146.3 <br />1.091 <br />4.362 <br />8.724 <br />1.50 <br />20 <br />287.9 <br />4.374 <br />17:37 <br />34.73 <br />6.00 <br />10 <br />1109.3 <br />1.127 <br />4.507 <br />9.014 <br />1.55 <br />.21 <br />274.4 <br />4.594 <br />18.22 <br />36.44 <br />6.30 <br />20 <br />1074.7 <br />1.164 <br />4.653 <br />9:305 <br />1.60 <br />22 <br />262.0 <br />4.814 <br />19'.08 <br />38.16 <br />6.60 <br />30 <br />1042.1 <br />1.200 <br />4.798 <br />9.596 <br />1.65 <br />.23 <br />250.8 <br />5.035 <br />19.94 <br />39.87 <br />6.90 <br />40' <br />1011.5 <br />1.237 <br />4.943 <br />9.886 <br />1.70 <br />24 <br />240.5 <br />5.255 <br />20.79 <br />41.58 <br />7.20 <br />50 <br />982.6 <br />1.273 <br />5.088 <br />10.18 <br />1.75 <br />25 <br />231.0 <br />5.476 <br />21.64 <br />43:28 <br />7.50 <br />6 <br />955.4 <br />1.309 <br />5.234 <br />10.47 <br />1.80 <br />26 <br />222.3 <br />5.697 <br />22. b0' <br />44.99 <br />7.80 <br />10 <br />'929.6 <br />1.346 <br />5.379 <br />10.76 <br />1.85 <br />27 <br />214.2 <br />5.918 <br />23.35 <br />46.69 <br />8.10 <br />20 <br />905.1 <br />1.382 <br />5.524 <br />11.05 <br />1.90 <br />28. <br />206.7 <br />6.139 <br />24.19 <br />48.38 <br />8.40 <br />30 <br />881.9 <br />1.418 <br />5.669 <br />11.34 <br />1.95 <br />29 <br />199.7 <br />6.360 <br />25.04 <br />50.07 <br />8.70 <br />40 <br />1 859.9 <br />1.455 <br />5.814 <br />11.63 <br />2.00 <br />1 30 <br />193.2 <br />6.583 <br />25.88 <br />151.76 <br />9.00 <br />The middle ordinate in inches for any cord of length (C) is equal to .0012 C' <br />multiplied by the middle ordinate taken from the above table. Thus, if it <br />desired to bend a 30 ft. rail to fit a 10 degree curve, its middle ordinate .should <br />be .0012X900X2.183 or 2.36 inches. + <br />TABLE III. Deflections for Sub Chords for.Short Radius Curves. <br />Degree <br />of <br />Curve <br />Radius <br />50 <br />M sub chord <br />R = sin of 1 def. angle <br />Length <br />of arc <br />for 100 ft. <br />sin. ss def. ang. <br />12.5 Ft. <br />15 Ft. <br />20 Ft. <br />25 Ft. <br />30*, <br />193.18 <br />1° <br />51' <br />2' <br />17' <br />2° <br />58' <br />3° <br />43' <br />IOI.15 <br />.32° .. <br />181:39 <br />1° <br />59' <br />z° <br />?5, <br />3° <br />10' <br />30581 <br />1 <br />io1.33 <br />340 <br />171.01 <br />2°o6' <br />.5500 <br />2°33' <br />.7167 <br />3°21' <br />.8833 <br />4°12' <br />.0667 <br />101.48 <br />360 <br />16i .8o • <br />. 2° <br />13,2* <br />.5667 <br />41' <br />3° <br />33' <br />4° <br />26' <br />io1.66 <br />380 <br />153.58 <br />2020' <br />.4167. <br />2°44' <br />.5833 <br />3°44' <br />4° <br />40' <br />IOI.85 <br />40° <br />146.19. <br />2° <br />2T <br />2° <br />57' <br />3' <br />S5'. <br />4°.54' <br />56 <br />Io2.o6 <br />42° <br />139.52 <br />2° <br />34' <br />3° <br />05' <br />4° <br />07' <br />5° <br />o8'. <br />102.29 <br />440 <br />133.47 <br />2° <br />41' <br />3° <br />13'. <br />40 <br />18' <br />S° <br />22' <br />102.53 <br />46° <br />i27. 97 ' <br />2° <br />48' <br />3° <br />21' <br />4° <br />�9, <br />5° <br />36'. <br />102.76 <br />480. <br />i22.92 ' <br />2° <br />55' <br />3° <br />29' <br />4° <br />40' <br />5° <br />50' <br />103 ' <br />50°'' <br />118.31 <br />3°02' <br />. <br />3°38' <br />4°51' <br />6°04' <br />103.24 <br />52° <br />114.o6 <br />3° <br />o9' <br />3° <br />46' <br />5° <br />02' <br />6° <br />17' <br />103.54 <br />54° <br />IIO.II <br />3°16' <br />3°'54' <br />5°13 <br />6°31' <br />103.84 <br />560 <br />1o6.5o <br />30 <br />22' <br />4° <br />02' <br />5° <br />23' <br />60 <br />44' <br />104.14 <br />58° <br />103.14 <br />3°29'4°10' <br />5°34' <br />60 <br />57' <br />104.43 <br />600 <br />100.00 <br />°35' <br />3035 <br />, <br />40 <br />18 <br />50 <br />44' <br />7°,11 <br />104.72 <br />T __ 5 tan R <br />� I R = T cot. 2 I Chord def. = chorda <br />T Sin. J D 50 <br />R= <br />Sin. 2 D _ :50 Sin. is D No. chords = I <br />R. E= R ex. sec 2 I D <br />Sin. J D= 50 T I E= T tan I I Tan. def. = 2 chord def. <br />The square of 'any distance, divided by twice the radius, will equal <br />the. distance from tangent to curve, very nearly. <br />To find angle for a given distance and deflection. <br />Rule 1: Multiply the given distance by .01745 (def. for 1° for 1 ft. <br />see Table II.); and divide given deflection by the product. <br />' Rule 2. Multiply'given deflection by 57.3, and divide the product by <br />the given distance. <br />To find deflection for a -given angle and distance. Multiply the angle <br />by :01745, and the product by the distance. <br />GENERAL DATA. <br />RIGHT ANGLE TRIANGLES. Square the altitude, divide by twice the <br />base. Add quotieilt to base for hypotenuse. ' <br />Given Base loo, Alt. 10.102=200=.5. 1o6+.5=1oo.5 hyp. <br />Given -Hyp.' ioo, Alt. 25.252=too=3.125. 100-3.125-96.875=Base. <br />Error in first example, .002; In last, .045• <br />To -find Tons of Rail in one mile of track: multiply weight per yard <br />by'i1, and divide by 7. <br />LEVELING. The correction for curvature and refraction, in feet <br />and decimals of feet is equal to 0.'574d2, where,d is the distance in miles. <br />The correction for curvature alone is closely, Jd2. The combined cor- <br />rection,is negative. <br />PROBABLE ERROR. If d,' d„ ds, etc. are the discrepancies: of various <br />results from the mean, and if 7'd2=the slim of the squares of these dif"Ier- <br />ences and n=the number of observations, then the probable error of the, <br />mean= <br />*0 7 6744n n 1 <br />SOLAR EPHEMERIS. Attention is called to the Solar Ephemeris f&I <br />the current year, published by Keuffel & Esser Co., and furnished free of <br />charge upon request; which is 34x5) in., with about 90 pages of data very <br />useful to the Surveyor; such as the adjustments of transits, levels and <br />solar attachments; directions and tables for determining the meridian <br />and the latitude from observations 'on the sun and Polaris; stadia meas- <br />urements; magnetic declination; arithmetic constants; English and Metric <br />conversions; trigonometric f ormulas; Natural and Logarithmic Functions; <br />and Logarithms of Numbers. <br />r. TABLE 1V. - Minutes <br />in Decimals of a Degree. <br />" Y <br />" <br />'.0167 <br />11' <br />.1833 <br />21' <br />.3500 <br />31' <br />.5167 <br />41' <br />.6833 <br />61' <br />.8500 <br />2. <br />0333 <br />12 1 <br />.2000 <br />22 <br />.3667 <br />32 <br />.5333 <br />42 <br />.7000 <br />52 <br />.8667 <br />g <br />.0500 <br />1 <br />.2167 <br />23 <br />.3833 <br />33 <br />.5500 <br />43 <br />.7167 <br />53 <br />.8833 <br />d <br />.0667 <br />14 <br />.2333 <br />24 <br />.4000 <br />34 <br />.5667 <br />44 <br />.7333 <br />54 <br />.9000 <br />5 <br />,0833 <br />15 <br />.2500 <br />25 <br />.4167. <br />35 <br />.5833 <br />45.7500 <br />S <br />.9167 <br />6 <br />,1000 <br />16 '. <br />.2667 <br />26 <br />.4333 <br />36 <br />.6000 <br />46 <br />.7667 <br />56 <br />.9333 <br />7" <br />.1167 <br />17 <br />.2833. <br />27' <br />.4500 <br />37 <br />'.6167 <br />47 <br />.7833 <br />57 <br />.9500 <br />S <br />1333 <br />18 <br />.3000 <br />28 <br />.4667 <br />38 <br />.6333 <br />48 <br />.8000 <br />58 <br />.9667 <br />9 <br />.1500 <br />19 <br />.3167 <br />29 <br />.4833 <br />39 <br />.6500 <br />49 <br />.8167 <br />59 <br />.9833 <br />10 <br />.1667 <br />20 <br />.3333 <br />30 <br />.5000 <br />40 <br />.6667 <br />SO <br />8333 <br />60 <br />1.0000 <br />TABLE V. -Inches in Decimals of a Foot. <br />1-16 3-t2 <br />5-16 <br />0052 0078 10 04 <br />:OlbB <br />.0208 0260 <br />. 313 <br />7 . 21 <br />.OB 5 .0�22 <br />1 2 3 <br />4 <br />5 6 <br />7 <br />8 9 <br />10 11 <br />.0888 .1667 .2500 <br />.3333. <br />.4167. .5000 <br />..5833 <br />..6667, .7600 <br />.8333 .9167. <br />