REPAIRING HEATING APPARATUS. 1<2.5 



ture fell below zero. On that day, however, it was 

 9° m — , with a clear sky and a very light air from the 

 N. N. W. The aurora was observed at the 

 same time. The planking and timbers, &c. of 

 the ship cracked from the contraction of the 

 cold, and the temperature of the officers' cabins 

 being below the freezing point, the vapour froze 

 until the hatches were shut down, and when this 

 had been done, caused more inconvenience still 

 by returning to its former state, and running 

 down from the beams and sides in streams, I now, 

 therefore, gave instructions for the constant use 

 of the warming apparatus, which on three pre- 

 vious trials had answered satisfactorily. Not 

 long, however, after the fire had been put into 

 the furnace, it was discovered that the heat 

 circulated only along one side of the ship, and 

 upon examination, a portion of the liquid, con- 

 sisting of brine, was found to have escaped. 

 The work of repair was forthwith commenced by 

 taking down the outer brickwork of the furnace, 

 between which and the latter was the worm of 

 the iron pipe that formed the heating apparatus. 

 It was a flaw or opening in this worm that had 

 allowed the liquid to escape, and this imposed on 

 us the additional trouble of putting the forge 

 together, which was accordingly done under a 

 canvass shed on the ice alongside. Here the 

 armourer, who had been supplied to us from 



