7% Sir J. South — Vibrations caused by Railway [1863. 



1847, March 12.— IV. 



No. 



Time. 



Observations. 



Yards. 



Eemarks. 



42 



43 

 44 



45 

 46 



h m s 

 8 40 II 



40 38 



40 54 



41 10 

 41 27 

 41 48 



KjLLfXXv ^U.li.« 



Parallel lines ; image 

 South gun. 



855 

 428 



302 

 416 



1031 



Velocity 37*7 miles; train 50 tons; 

 152 feet. 



The image trembled very much du- 

 ring the whole time of passage 

 through the field. 



1847, March 15.— I. 



47 

 48 



49 



50 

 51 

 52 

 53 

 54 



55 



7 21 14 

 22 6 

 22 10 

 22 37 



22 50 



23 5 



23 15 



23 22 



24 6 



24 51 



Shaft gun. 



Line brilliant ; changed 

 suddenly to 



South gun; cross very 

 strong. 



1176 

 686 



430 



349 

 303 

 311 



335 

 1078 



Velocity 20-5 miles ; train 12 5-5 tons ; 

 engine 22 tons ; length of train 409 

 feet ; 18 carriages. 



II. 



56 



57 

 58 



59 



7 25 55 



26 10 



27 I 

 27 10 



27 55 



28 18 



South gun. 



Parallel lines very strong 

 Do. do. very beautiful,.. 

 Shaft gun. 



775 



303 

 324 



922 



Velocity 22*6 miles ; train 209-5 tons ; 

 length of train 1 72 feet ; slow goods 

 train. 



III. 



60 

 61 



62 

 63 



64 

 65 



7 31 19 

 31 52 



31 58 



32 30 

 32 32 



32 48 



33 48 



34 22 



Shaft gun. 



Single line very strong . 

 Changed to (5) parallel 



South gun. 



1032 

 706 



384 



37i'5 

 308 



992 



Velocity 21*6 miles; train 91*5 tons ; 

 engine 14*5 tons; train's length 

 3 1 9 feet. 



IV. 



66 

 67 



68 



69 



70 



71 

 72 



73 



7 43 37 

 43 44 



43 57 



44 22 



45 

 45 18 

 45 37 



45 52 



46 38 

 46 42 



Shaft gun. 



Trace of (5) parallel lines 

 South gun. 



786 

 740 



502 

 328 

 302 

 336 

 391 



679 



Velocity 14*8 miles ; train 49*5 tons ; 

 engine 14-5 tons ; train's length 

 150 feet; six carriages. 



[leaving the tunnel. 

 I never saw it cease so soon after 



