KEITH'S RAILROAD CURVE TABLES. 



Published by KEUFFEL & ESSER CO., New York. 



Entered according to Act of Congress in the year 1883, 

 by W. Keuffel & H. Esser, in the office of the Librarian of Congress, 



in Washington, D. C. 

 Copyright, 1902, by Keuffel & Esser Co. 



HOW TO USE KEITH'S TABLES. 



EXAMPLE. 



Wanted a Curve with an Ext. of about 12 ft. Angle 

 of Intersection or I. P. -23° 20' to the R. at Station 

 542+72. 



Ext. in Tab. IV opposite 23° 20' = 120.87 

 120.87 -12 = 10.07. Say a 10° Curve. 



Tan. in Tab. IV opp. 23° 20' = 1183.1 

 1183.1 --10 = 118.31. 



Tab. V correction for A. 23° 20' for a 10° Cur. =0 16 

 118.31+0.16 = 118.47 = corrected Tangent. 



(If corrected Ext. is required find in same way) 

 Ang. 23° 20' =23.33° -10= 2.3333 = L. C. 



I. P. = sta. 542+72 

 Tan. = 1.18.47 



2° 19!' 



= def . for sta. 



542 



4° 49!' 



__ u a (i 



+50 



7° 19|' 



_ u u a 



543 



9° 49!' 



= " " (i 



+50 



11° 40' 



.—. a tt it 



543 + 







86.86 



B. C.=sta. 541+53.53 

 L. C. = 2.33.33 



86.86 J E. C.=Sta. 543+86.86 



100-53.53 =40.47X3'(def. for 1 ft. of 10° Cur.) = 139.41' - 

 2° 19|" = def. for sta. 542. 



Def. for 50 ft. =2° 30' for a 10° Curve. 

 Def. for 36.86 ft. = 1° 50!' for a 10° Curve. 

 (These tables are published in Field Books of 

 Keuffel & Esser Co., New York, N. Y.) 



