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~! <br />~N <br />~! ~~~L-~ ~ ~ o <br />f ~ ~ ~~~ ~~ <br />0 V ~l ~.~ ,,~~ /~~~ <br /> <br />~y~ ~/ <br />- ~' - ~ e - G• '' ~~ <br />KEITH'S RAILROAD CURVE TABLES. <br />Published by KEUFFEL 8v ESSER CO., New York. <br />Entered according to Act of Congress in the year 1883, <br />by W. Keuff el & H. Esser, in the .office of the Librarian of Congress, <br />in Washington, D. C. <br />Copyright, 1902, by Keuffel & Esser Co. <br />HOW TO USE KEITH'S TABLES. <br />EXAMPLE. <br />' Wanted a Curve with an Ext. of about 12 ft. Angle <br />of Intersection or I. P. =23° 20' to the R. at Station <br />542 -{--72. <br />Ext. in Tab. IV opposite 23° 20'=120.87 <br />120.87 =12 =10.07. Say a 10° Curve. <br />Tan. in Tab. IV opp. 23° 20'=1183.1 <br />1183.1=10 =118.31. <br />Tab. V correction for A. 23° 20' fora 10° Cur. =0.16 <br />118.31 ~-0.16 =118.47 =corrected Tangent. <br />(If corrected Ext. is required find in same way) '~ ;a <br />Ang. 23° 20' =23.33° =10 = 2.3333 = L. C. <br />• 2° 192' =def. for sta. 542 I. P. =sta. 542 x-72 <br />4° 492' _ " " -f-50 Tan. = 1.18.47 <br />0 2'- K K K <br />7 19- - `'~3 B. C.=sta. 541-•53.53 <br />9° 492' _ " " <br />11° 40' _ " K 543 ~ - L. C. = 2.33.33 <br />' 86.86 E. C. =Sta. 543-{-86.86 <br />100-53.53=46.47X3'(def. for 1 ft. of 10° Cur.) =139.41'= <br />2° 192"=def. for sta. 542. <br />------- <br />__ <br />i n t ,/ ~ ~ 0,; f-~ ~~ <br />- <br />rr _ __ <br />~L - <br />v <br />Def. for 50 ft.=2° 30' fora 10° Curve. <br />d Def. for 36.86 ft. =1° 502' fora 10° Curve. <br />• (These tables are published in Field Books of ~ <br />/'~ KEUFFEL &ESSER Co., New York, N. Y.) ~ <br /> <br />