A New System for Preventing Collisions at Sea 



this plan when tried proved an absolute failure. The very 

 powerful blast given off by the instrument is extremely painful 

 to the ears and renders them incapable of hearing the very 

 feeble echo which is supposed to occur only a few seconds 

 later. Moreover, sirens or steam whistles of great power 

 are extremely objectionable on board passenger ships ; they 

 annoy the passengers and render sleep impossible. It is, there- 

 fore, only too evident that nothing in the way of a light or 

 noise producing apparatus could be of any use whatsoever. 



