Description or the Tables. lxv 



the order noted below. The Gottingen mean time is 49 m 50 B in advance of the 

 Makerstoun time. The second column gives the height of the barometer, corrected 

 to 32° Fahr., see No. 88. The barometer is generally observed between the ob- 

 servations of the declination and bifilar magnetometers, that is, about 70 s after the 

 hour. 



The third and fourth columns give the observed readings of the dry and wet 

 bulb thermometers in degrees of Fahrenheit, uncorrected for scale errors, see No. 91, 

 and the fifth column gives the difference of the observed readings of the two thermo- 

 meters. The dry and wet bulb thermometers are generally read about l^ m before 

 the hour. The sixth column contains the maximum pressure of wind on a square 

 foot of surface which has occurred since the previous observation, see No. 102 ; this 

 maximum is generally noted, and the index set back 2 m or l m before the hour. 



The seventh column contains the maximum pressure of wind on a square foot 

 of surface within from 8 m to 10 m at the time of observation, namely, from 2 m or l m 

 before the hour till 6 m or 9 m after the hour. 



The eighth column contains the direction of the wind read from the dial-plate 

 of the vane, and given in numbers of points of the compass, reckoning N = 0, E = 8, 

 S = 16, W = 24. 



The ninth column gives the directions of motion of three strata of clouds in 

 numbers of points of the compass, namely, of scud, cirro-stratus, and cirrus ; thus, 

 September 25 d 2 b , the surface wind, by the vane, blowing from 22 (WSW.), the scud 

 was moving from 24 (W.), the cirro-cumulo-stratus was moving from 27 (NW. by W.), 

 and the cirri were moving from 30 (NNW), see No. 103. 



The tenth column contains the estimated extent of sky clouded, the whole hemi- 

 sphere covered being 10. 



The eleventh column contains the species of clouds observed, with other meteor- 

 ological notes, see Nos. 103, 104, and 105. 



The observer's initial will be found at the corresponding hour of hourly mag- 

 netical observations. 



112. Daily Meteorological Observations, pages 310-312. 



The first column contains the civil day of observation, and the first column of 

 each triplet of columns thereafter contains the minimum temperature noted from the 

 self-registering thermometer about 10 h a.m. ; the second column contains the maxi- 

 mum temperature noted from the self-registering thermometer at 5 h p.m., see No. 92 ; 

 and the third column contains the amount of rain found at noon in the Observatory 

 rain-gauge. In page 311, the temperature of water in two pump-wells is given, 

 see No. 93. In page 312 are given the maximum temperature of solar radiation, 

 and the minimum temperature of terrestrial radiation for portion of the year, see 

 No. 92. 



113. Extra Meteorological Observations, pages 313-325. 



The first column of observations of the actinometer contains the Makerstoun 



MAG. AND MET. OBS., 1844. T 



