312 Professor Forbes's Account of 



The boring rods left in the hole are supposed to be by this 

 time entirely oxidated, for in 1826 they were found to have 

 fallen together so as to occupy a space of only 12 feet. 



The flow of brine after the bore was finished amounted to 

 21 J cubic feet per min. at 2J per cent., and temp. 15° R. At 

 the same time, the Reiche-hrunn en yielded 8 cubic feet as formerly. 

 The phenomena of the spring continued nearly as above de- 

 scribed, with an ebb recurring irregularly, but several times a- 

 day until the 2d April 1823, when the ebb lasted eighteen 

 hours, and on the 3d April six hours. 



By the 7th July 1 823, the flow had increased to 34| cubic feet 

 and that of the Reiche-brunnen diminished from8 to 4^ cubic feet. 

 By many measurements in 1826 and 1827, it appeared that the 

 flow had increased to 40 cubic feet, at which it has since remained 

 nearly stationary ; but it had by this time almost wholly ab- 

 sorbed the Reiche-brunnen. In 1826 and 1827, when the pump- 

 ing machinery* was placed in the eastern part of the building 

 for the purpose of conveying the water for evaporation, the 

 spring first became tolerably regular in its movements which 

 occurred nearly as in the following example. On the 5th Au- 

 gust 1826, all the pumps acting, after the flow had proceeded 

 with more than common vehemence for a quarter of an hour, 

 the surface became calm, and after twenty minutes, had de- 

 scended 9 ft. 3 inches in the shaft, the stratum of gas resting 

 on it and descending with it. At this depth the surface re- 

 mained still for half a minute, when the flow recommenced, and 

 after thirty-seven minutes the water stood as at first. All this 

 time it is to be understood that the pumps were acting, which 

 of course tends so far to accelerate the depression and to retard 

 the ascent of the water in the shaft. 



The duration of the ebb was for some time observed day 

 and night (the pumps also working). From the 15th to the 

 30th September 1826, the spring ebbed eighty times, or five 

 times daily. The periods of ebb (including the times of fall- 

 ing and rising) amounted within the same interval of time to 

 165 hours ^5 min., or 10 hours 22^'g min. in 24 hours. From 



* This consists of eight pumps, which are moved by a water wheel, and 

 raise the brine out of the sliaft for the purpose of evaporation. 



