Il6 JOURNAL OF THE 



Having computed all the ordinates for the eight stations, 

 measure the successive values of y along SY from S and 

 the corresponding ordinates or offsets x, at right angles to 

 SY, until all the stations are located. 



2. By deflection angles. 



The method is similar to that of running in a circular 

 curve with transit and chain. 



Example. Let ^ = 25, N =: 7. 



Deflect from tangent SY, with transit at S, successively, 



Ai = 2\ A, = 8', A3 = 18', A4 = 32^ A5 = 50^ Ag = I°I2', 



A7 = i°38' and measure S i = 25 feet, 12 = 25 feet, and 

 so on, to fix the stations i, 2, 3, etc. 



The degree of the circular curve connecting at station 7 

 Z 980 



is, D° = - = = 5°.6 - 5°36^ 



N<r 7 X 25 



If instrument has to be set at sta. (3) and the balance of 

 the curve run in from (3), clamp vernier at A3 = 18' before 

 removing from S; then set over (3), verify reading and 

 sight to S with angle 18' on plate, deflect to a^ = 54' to 

 sight on tangent if desired; then reversing telescope and 

 taking from table, angles ?3_4, /3_5, i^_s^ ?\^j^ equal i°i4\ 

 i°38', 2°o6^ and 2^38' respectively, deflect successively to 

 these readings to locate stas. 4, 5, 6 and 7. At {7) with 

 angle 2°38' on plate, sight to (3) and turn off to a^ = 4^54' 

 for the common tangent at (7). Reversing telescope, we 

 run in the 5°36' circular curve as usual from this tangent. 



The curve is as easily run in backwards. Thus having 

 run the circular curve and turned into tangent at 7, set 

 vernier at a^ = 4°54', so that on turning to o°oo' we sight 

 along a line parallel to final tangent SY. 



We then set vernier to angle 4-7 = 4° 14' to fix (6), i^_y = 

 3°38' to fix (5), /;_, = 3°o6' to fix (4;, l,_, = 2^38' to fix (3), 

 etc. If we cannot see beyond (3), remove to (3) and with 

 vernier reading as before i-^_~ = 2° 38', sight to (7), reverse 



