9, PRELIMINARY CHAPTER. 



made to accommodate her to the new service on 

 which she was destined, and a leak, which had 

 been discovered on a short trip which she had 

 made to Hull, was effectually repaired. She 

 was also provided with a warming apparatus, 

 which however, though probably well calcu- 

 lated for more temperate climates, was not 

 found to answer its intended purpose in the 

 North. 



It may be briefly described as a purely wrought 

 iron pipe two hundred and forty feet long, an 

 inch in diameter, and five eighths of an inch 

 bore, extending nearly round the ship and the 

 midship cabins ; the solution of strong brine, with 

 which it was filled by the aid of a forcing-pump, 

 being kept hot by means of a furnace, strongly 

 built in brick within an iron tank or casing, in 

 the interior of which several coils of pipe wound 

 round. To guard against accidents, there were 

 expansion tubes abaft the first bend coming from 

 the furnace, which, in case of an excess of heat, 

 became filled, and so prevented the bursting of 

 the apparatus. 



The advantage proposed to be gained over the 

 well-tried method adopted by Sir E. Parry, was 

 a diminution in the consumption of coals, a 

 bushel being considered quite enough for a 

 day's use. How far this calculation would have 

 been borne out by fact, there was no opportunity 



