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NOTES TO THE OBSERVATIONS OF THE SELF-REGISTERING THERMOMETERS. 
ExtTRA METEOROLOGICAL OBSERVATIONS, 1845. 
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Jan. 4 23. The temperature has risen during the night, so that no minimum could be obtained; the maxi- 
mum given for Jan, 44 most probably occurred this morning (Jan. 52.) 
Jan. 11 The maximum temperature given occurred between 104 195 and 104 22, 
Jan. 22 The minimum temperatnre seems somewhat uncertain. 
Jan, 24 The maximum temperature seems somewhat uncertain, 
Jan. 31 The minimum radiation thermometer and the standard thermometer immersed in snow, at a tem- 
perature of 32° and of 20°, when the former read 0°1 less than the latter. A new coating 
of lamp-black varnish put over the minimum radiation bulb, which was afterwards roughened. 
Feb. 3 About 1°:5 of alcohol found detached in the minimum radiation thermometer ; the thermometer 
was adjusted Feb. 8) 45, and the observations previously were corrected for the induced index 
error, which has been done in all similar cases. 
Mar. 15 5. The temperature has been varying much and irregularly to-day ; the reading given is quite accu- 
rate; the maximum, therefore, probably occurred before 1”, 
Mar. 21 22. There has been no minimum during the night. 
Mar. 23 20. About 0°7 of alcohol found detached in the minimum radiator ; this must have again joined the 
column of alcohol, as it could not be seen on the 28th. 
Apr. 11 The minimum temperature from the self-registering thermometer lost ; the quantity given is esti- 
mated from the observations of the dry-bulb thermometer. 
Apr. 16 The bulb of the minimum radiator was covered anew with lamp-black, the last coating having 
been nearly washed off by tbe rain. The maximum radiator was placed about 3 inches above — 
the surface of the soil, and a shade from the wind was placed round it: it has been 15 inches ; 
above the soil since November. 
Apr. 30 20. About 0°:4 of alcohol found detached in the tube of the minimum radiator; the bleb was near 
the top of the tube on May 5, and on May 6¢ 5) it had disappeared. 
July 18 7. 2°6 of mercury found detached from the column in the maximum thermometer. 
July 27 22. The index of the maximum thermometer out of order; the temperature at 274 2" was 66°4 by 
Aug. 6 8. The speculum of the minimum radiator was resilvered, [the dry-bulb thermometer, 
Sept. 1 The bulb of the minimum radiator was reblackened, 
Oct. 30 The mercury and index of the maximum thermometer adhere. 
Nov. 10 and 134, The index of the maximum thermometer has probably been adhering to the mereury. 
Dec. 25 The maximum radiating thermometer raised 18 inches above the soil, in order to allow the sun 
to shine more perfectly upon it. 
Dec. 30 1, The minimum thermometer was set at 193h, The maximum is that since Dec. 294 225, 
TEMPERATURE OF WATER IN PUMP WELLS. 
Géttingen Temperature of Water. Géttingen Temperature of Water. Giittingen Temperature of Waters 
ee Pump Wells. see Pump Wells. sige Pump Wells. 
Observations. || Cottage. Gate. Observations. Cottage. Garden. Observations. Cottage. Garden, 
ahh 4] ° h. 2 te ° oq 
Jan. 6 5 || 44-4 5 44-0 Sept. 15 5 49-6 49-7 
13.5 | 44-1 5 44-6 22 5 49-7 49.7 — 
20 5 43-7 5 44-8 29 5 49-7 50-0 
27 «5 43-6 5 45-2 Oct. 6 5 49-6 49:8 
Feb. 3 5 43-1 5 45-4 135 ooo 50-2 
10 5 42-6 5 46-0 14 4 49-4 oo 
yD) 42-3 5 46-2 Dina, 49-1 50-2 
24 5 42-3 5 46-6 27 «5 49-0 50-2 
Mar. 3 5 42-1 oy 47-3 Nov. 4 5 49-0 50-0 
10 5 42-0 5 47-5 10 5 48:3 49:8 
Line 3 41-6 5 47-8 17 5 47-6 49.4 
24 5 41-6 5 48-1 24 9 47-2 48.9 
April 2 5 41-9 5 48-4 Dee. 1 5 47-0 49-0 
if 42-2 5 48-7 8 5 46-2 48-5 
14 5 42-5 5 49-0 15° 5 45:5 48-1 
21 5 tee 5 49-1 22 5 45-0 47-3 
28 5 43-1 5 49-4 31 5 44-6 47-7 | 
May 5 5 43.7 5 49-4 e | 
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