RECENT EXPERIMENTS ON FOG-SIGNALS. 



273 



to that instrument. Proceeding along the sea margin 

 at Flamboro' Head, Mr. Edwards states that at a dis- 

 tance of 1^ mile, with the 18-pounder previously used 

 as a fog-signal hidden behind the cliffs, its report was 

 quite unheard, while the 4-oz. rocket, rising to an eleva- 

 tion which brought it clearly into view, yielded a power- 

 ful sound in the face of an opposing wind. 



On the evening of February 9th, 187 7, a remarkable 

 series of experiments were made by Mr. Prentice at 

 Stowmarket with the gun-cotton rocket. From the 

 report with which he has kindly furnished me I extract 

 the following, particulars. The first column in the 

 annexed statement contains the name of the place of 

 observation, the second its distance from the firing-point, 

 and the third the result observed : 



Stoke Hill, Ipswich 

 Melton . . . 



Framlingham . . 



10 miles Sockets clearly seen and sounds 

 distinctly heard 63 seconds 

 after the flash. 



15 Signals distinctly heard. 

 Thought at first that sounds 

 were reverberated from the 



18 



Stratford. St. Andrews . 19 

 Tuddenham. St. Martin 10 



Christ Church Park. . 11 



Nettlestead Hall 



Bildestone 



Nacton . 14 



Signals very distinctly heard, 

 both in the open air and in a 

 closed room. Wind in favour 

 of sound. 



Keports loud ; startled pheasants 

 in a cover close by. 



Eeports very loud ; rolled away 

 like thunder. 



Keport arrived a little more 

 than a minute aft er flash. 



Distinct in every part of ob- 

 server's house. Very loud in 

 the open air. 



Explosion very loud, wind 

 against sound. 



Reports quite distinct mis- 

 taken by inhabitants for clapa 

 of thunder. 



