NOTES ON THE CREMORNE BORE. 463 
bottom just sufficiently large to admit of the upper end of the 
tube being passed up it, and oxygen gas from a compressed cylinder 
was blown through a Fletcher’s Blowpipe on to the charcoal, so 
that in less than half a minute the solder in the threads of the 
cap-piece was melted—the lower portion of the tube containing 
the thermometers being meanwhile wrapped in wet cloths to 
prevent the heat travelling downwards. The cap-piece having 
been unscrewed and the thermometers withdrawn, the highest 
temperature registered was found to be 97° Fah. 
In spite of the tube having remained for twenty-seven hours 
under the great hydrostatic pressure it must have sustained at a 
depth of 2,733 feet, not a drop of water had found its way into 
the tube, a fact, which speaks for itself as to the excellence of the 
work done by the plumber, Mr. James Gilchrist, of 174a Pitt 
Street, Sydney. 
On the following day the experiment was repeated, the tarred 
rope alone being used with a weight of only about thirty pounds, 
including that of the tube. This time the tube was withdrawn 
after it had remained down the bore one hour. The stoppage of 
the tube in the bore at a depth of 2,733 feet, was this time dis- 
tinctly perceptible, and so the cause of the kinking of the piano 
wire on the previous occasion was explained. 
The maximum temperature registered by the three overflow 
thermometers was 96° Fah. The maximum and minimum ther- 
mometer was found to have been shattered, probably through the 
jarring of the tube against the sides of the borehole. The lower 
temperature recorded on the occasion of the third experiment as 
compared with that of the second, was probably due to the tube 
carrying the thermometers and the sheet lead wrapped round it, 
(in order to increase its weight) having slightly chilled the water 
at the point where the temperature was taken, and the time 
allowed (one hour), before the tube was withdrawn having been 
too short to admit of the water around the tube in the bore 
resuming the normal temperature of the surrounding rock. 
