ON DEEP-SEA SOUNDING BY 

 PIANOFORTE WIRE. 



\JPaper communicated to the Society of Telegraph Engineers, 

 April 22nd, 1874] 



ON the 29th of June, 1872, I sounded, from the 

 Lalla Rookh scliooner-yacht, in the Bay of 

 Biscay, with a lead weight of 30 Ibs., hung by 19 

 fathoms of cod-line from another lead weight 

 of 4 Ibs. attached to one end of a three-mile coil 

 made up of lengths of pianoforte wire spliced 

 together, and wound on a light wheel about a 

 fathom in circumference, made of tinned iron plate. 

 The weight was allowed to run directly from the 

 sounding-wheel into the sea, and a resistance 

 exceeding the weight in water of the length of the 

 wire actually submerged at each instant was applied 

 tangentially to the circumference of the wheel, by 



VOL. in. z 



