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<br />f ~~ <br />s, <br />~~:.~ <br />~~~ <br />. r <br />I~,i~~ <br />4- -----t---- <br />- -- -~ -- <br />i <br />i <br />~_ <br />- _~._.1~ <br />-- ., <br />~ ~#.~ <br />--~~ ~ <br />~'~i ~~ ~ d ~~ -~ ~7 <br />I'~ ^`' "" t`` <br />T- c9 <br />v .. <br />,KEITH'S RAILROAD CURVE TABLES. <br />Published by KELTFI+EL 8s ESSER CO., New York. <br />Entered according to Act of Congress in the year 1883, <br />by W. Keuffel & H. Esser, in the ofnce of the Librarian of Congress, <br />in ~rVashington, D. C. <br />Copyright, 1902, by Keuffel & Esser Co. <br />HOW TO USE KEITH'S TABLES. <br />E%AMPLE. <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. I V 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) <br />Ang. 23° 20' = 23.33° =10 = 2.3333 = L. C. <br />2° 191'=def. for sta. 542 I. P. =sta. 542-F72 <br />4° 491' _ " " -I-50 Tan. = 1.18.47 <br />7° 191' _ " " " 543 <br />~° 492, _ " rr " +50 B. C. =sta. 541--53.53 <br />l I° 40' _ " " " 54.3+ L. C. = 2.33.33 <br />86.86 E. C. =Sta. 54.; ~-86.86 <br />100-53.53=46.47X3'(def. for 1 ft. of 10° Cur.) =139.41'= <br />2° 191"=def. for sta. 542. <br />Def. for 50 ft. =2° 30' fora 10° Curve. <br />Def. for 36.86 ft. =1°502' fora 10° Curve. <br />(These tables are published in Field Books of <br />KEUFFEI, & EssEa Co., New York, N. Y.) <br />