CORNISH VIADUCTS. 231 



In each case during reconstruction, the main line was pro- 

 tected by an efficient set of signals. Every care was taken 

 to prevent accidents, and the drivers of passing trains were 

 requested to whistle when approaching the viaduct. It is 

 highly satisfactory, and very creditable to those concerned, 

 to know that not only has no mishap occurred to the traffic, 

 but that not a single train has, so far as the author is aware, 

 been delayed any length of time in consequence of the 

 alterations. 



In conclusion, the author must mention that he is indebted 

 to the resident engineer, Mr. T. H. Gribbons, who has most 

 kindly provided him with many details in connection with 

 the reconstruction of these Cornish viaducts. 



