Ixii Introduction to the Makerstoun Observations, 1843. 



Term-Day Observations of Magnetometers, pages 29 — 48. 



103. The first column contains the minute in Gottingen mean time of the de- 

 clination observation. The hour is given in the middle of each triplet of columns. 



The second column gives the absolute westerly declination in degrees, minutes, 

 and decimals. 



The third column gives the bifilar magnetometer mean scale readings, corrected 

 for temperature to 26° Fahr. The observations are made 2" after those of the de- 

 clination. 



The fourth column contains the balance magnetometer micrometer readings, 

 corrected for temperature to 26° Fahr. The observations are made 3™ after those 

 of the declination. 



104. The readings of the bij&lar and balance thermometers at the commence- 

 ment of each hour are given, together with the initial of the observer during the 

 hour, at the foot of each page. 



105. The corrections for temperature are applied thus : — The first observation 

 (at the commencement) of each hour is corrected for the difference of the magnet's 

 temperature at the hour from 26° Fahr., the corrections to the observations between 

 the hours are then interpolated between the initial corrections. 



Extra Observations of Magnetometers, j)ages 49 — 73. 



106. These are observations made generally during magnetic disturbances. 

 The same remarks apply with regard to temperature con-ections, &c., as in the 

 term observations, excepting that the Gottingen day and hour are given in the first 

 column, and the minute is given for the observations of each instrument. 



107. The observations of magnetic dip and absolute horizontal intensity require 

 no other explanation than will be found in sections 4 and 8. 



Daily Meteorological Observations, pages 86 — 197. 



108. The first column contains the Gottingen mean time, astronomical reckon- 

 ing, of the observations, all of which are made within a few minutes of the hour, 

 and generally in a certain order. The Gottingen time is 49™ 50^ in advance of the 

 Makerstoun time. The second column contains the readings of the barometer cor- 

 rected for temperature, and to the Royal Society's standard barometers. See No. 83. 



The third column gives the observed readings of the dry bulb thermometer in 

 degrees Fahrenheit. 



The fourth column contains the observed readings of the wet bulb thermometer. 



The fifth column gives the differences of the readings of the dry and wet bulb 

 thermometers. 



The sixth column contains the readings of the maximum and minimum register 

 thermometers, corrected by the quantities in Table 23. The minimum temperature 

 of the night, read at 9 a.m. Makerstoun mean time, is immediately preceded by the 

 maximum of the previous day, read at the same time. 



