on local Heat. j 1 1 
meat. The temperature of the fprings I took in the following 
manner. 
After fathoming each well with a line and plummet, I let 
one thermometer down to the bottom, and fixed another on the 
line, io as to reach to half the depth only, keeping a third to 
take the temperature of the air at the top. 
Degrees of heat in the wells. 
Oct. 6, 1784. Temperature of 
the water in King’s Well, 
at Sheernefs. 
By thermometerat thetop53* 
By ditto at the middle 5 1 
By ditto at the bottom 56 
Found the well 280 feet 
deep * with 1 80 feet water. 
Sept. 28, 1784. Temperature of 
the water in the new well in 
Dover Caflle. 
By thermometer at the top 56° 
By ditto at the middle 52 
By ditto at the bottom 48 1 
Found the well ^60 feet deep 
with 21 feet water. 
About noon was the time of day when I made the experi- 
ments at both places, and the top of the relpedlive w r ells vary- 
ing from each other depended w' holly on the accidental tempe- 
rature of the atmoiphere at the time; but that the thermome- 
ter at half the depth of the well at Dover gave nearly the 
mean heat of the top and bottom, while that in a correfpond- 
ing fituation in the well at Sheernefs gave it colder than either 
top or bottom, 1 attribute to the following circumfiance. 
Over the well at Sheernefs a machine is erected, which railes 
the water by means of an horizontal windmill, working an 
endlefs chain. This chain, confiffing of jointed double bars, 
with a number of buckets fixed thereon, at certain difiances 
from each other, continually delcending into, and afeending 
•ut of the water, to an elevation of eight or nine feet above 
* The fand brought up from the bottom of the well by the force of the fpring 
kas reduced it to its prefent depth. 
the.- 
