A New System for Preventing Collisions at Sea 



In conclusion, I would say that, as steamships are always 

 provided with plenty of steam power, there is no reasonable 

 limit to the size of the apparatus that may be used. It may 

 be possible to send out a series of pulsations that will travel 

 over a distance of 100 miles and be received by the delicate 

 apparatus which I prefer to call a " recorder." 



In this little booklet, I have only shown devices that are 

 easily understood by the unscientific. For producing the 

 primary vibrations on the ship I use a modified form of a 

 siren, with certain improvements that make it much more 

 powerful than those now in use. For receiving the echo, 

 I have shown two separate devices one that rings a series 

 of bells of assorted sizes according to the intensity of the 

 echo, and another for recording the echo and showing, in a 

 very graphic manner, the distance that the object is from the 

 ship. In both of these, I employ a simple diaphragm stretched 

 over the head of a cylinder after the manner of a drum, 

 and it is the vibrations of these diaphragms that open and 

 close the electrical circuit that rings the bells in the one 

 case, and in the other case produces zigzag lines on a strip 

 of paper. 



Full and complete working drawings have been made of all 

 of these devices, and, of course, these large, coloured drawings 

 are much easier to understand than the very small illustra- 

 tions which form part of this booklet. However, if interested 

 parties wish to see the large drawings, I am prepared to 

 show them. 



The apparatus will work exactly as described with the 

 devices already designed, but I am not going to rest at this 

 point. I shall shortly produce a recording instrument with 



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