BY WJI. FRYAR, INSPECTOR OF MIXES, QUEENSLAND. 19 



being 82 degs. at the surface of the Smithfield United Mine - 

 that at 400 feet was found to be 74 degs. ; at 600 feet, 76 

 degs. ; at 800 feet, 79 degs. ; at 1,150 feet, 81 degs. ; and at 

 1,270, the bottom of the shaft, where the men were working,^ 

 82 degs. The 400 feet level is opened into another mine, but 

 no perceptible current of air was passing. No communication iS' 

 opened below this level. Three shifts of three men each are at 

 work ; the shaft bottom is somewhat wet ; the rock drill is 

 worked by compressed air, and the exhaust affords ventilation, 

 but the compression produces heat ; hence the high temperature 

 at the bottom and its gradual diminution towards the surface. 



It will be seen that at the surface of the Golden Crown 

 shaft the temperature in March was 19 degs. less than in 

 December, but that at the bottom (1,200 feet) it was the same. 

 At the Ingle"\vood the surface change was the same (19 degs.), 

 while the temperature at the bottom was 3 degs. lower than 

 on the former occasion. The temperature of the bottom of the 

 Great Monkland shaft was 1 degree lower than in the December 

 observation. No opportumity for observation presented itself 

 at the United Smithfield in December, so tliat no comparison 

 can be made. 



The third series of observations was taken on the 18th 

 June, when our coldest time is close at hand. At 8 a.m. at the- 

 surface of the Smithfield United, the thermometer indicated 

 49 degs. ; at 400 feet, 74 degs. ; at 600 feet, 80 degs. ; at 800 feet, 

 81 degs. ; at 1,150 feet, 82 degs. ; and at 1,340 feet, 87 degs. 

 At the 400 feet level which is holed into another mine, the- 

 temperature was exactly the same as on a previous occasion at 

 which observations were taken, although that at the surface was 

 33 degs. lower; at the other levels or recesses in the shaft (for that 

 is what they are) the temperature was slightly higher, and in the 

 bottom it was 5 degrees higher, doubtless owing to the fact that 

 the centering was 40 feet from the bottom, and that the rock 

 drill was not being worked, nor was there any means of forcing 

 ventilation in use. The weather on this occasion was dry, 

 cold, seasonable weather ; and at 12 noon on returning to the 

 surface the thermometer indicated 66 degs. 



At the Inglewood shaft at 1 p.m., thermometer 66 degs. ; 

 at 300 feet, 70 degs. ; at 600 feet, 70 degs. ; at 1,200 feet,. 



