482 BEN NEVIS OBSERVATORY. 



Table X. Barometer. — The departures in thousandths of an inch at each hour 

 from the general mean for each month. Heavy type signifies an excess and italic type 

 a defect from the mean which is given in the last column — values are given correspond- 

 ing to each of the three parts of Table IX. In this and the subsequent departure tables, 

 the values have been adjusted for the differences between the midnight values at the 

 beginning and end of each mean day according to the method described in the Appendix 

 to the last volume of observations (see Trans. R.S.E., vol. xlii. page 543). 



The values given in the second and third sections of this table are also shown 

 graphically by curves in the diagram at page 502. 



Table XL Temperature. — The mean hourly values for each month : 1st, at Ben 

 Nevis for the 20 years 1884 to 1903 inclusive ; 2nd, at Ben Nevis for the 13 years 1891 

 to 1903 ; and 3rd, at Fort-William for the same 13 years. 



Table XII. Temperature. — The departures at each hour from the general mean 

 for each month. Heavy type above the mean and italic type below it. Values are 

 given corresponding to each of the three sections of Table XL, but in this table the means 

 and departures are computed to hundredths of a degree and not to tenths only, as in 

 Table XL The values given in the second and third sections of this table are also 

 shown graphically by curves in the diagram at page 502. 



Table XIII. Dry and Wet Bulbs. — The mean hourly values of the difference of 

 the dry and wet bulbs : 1st, at Ben Nevis for the period from May 1884 to December 

 1903 — that is, 19 years and eight months ; 2nd, at Ben Nevis for the 13 years 1891 to 

 1903 inclusive ; and 3rd, at Fort- William for the same 13 years. The wet bulb record 

 from January to April 1884 at Ben Nevis contained so many interruptions that it could 

 not be used in computing the mean values for these months. 



Table XIV. Dry and Wet Bulbs. — The departures at each hour of the difference 

 of the dry and wet bulbs from the average monthly differences. Heavy type above 

 the mean and italic type below it. Values are given corresponding to each of the three 

 parts of Table XIII. , but the means and departures are computed to hundredths of a 

 degree. 



Table XV. Rainfall. — The mean hourly values for each month : 1st, at Ben Nevis 

 for the 19 years 1885 to 1903 inclusive; 2nd, at Ben Nevis for the 13 years 1891 to 

 1903 ; and 3rd, at Fort- William for the same 13 years. 



The self-recording rain gauge at Fort- William was not in use during the months of 

 March and April 1891 and January 1892 ; these months were therefore omitted in 

 computing the 13 years' average at both Observatories. 



Table XVI. Rainfall. — The departures at each hour from the general hourly 

 mean of each month, and of the year. Heavy type above the mean and italic type 

 below it. Values are given corresponding to each of the three sections of Table XV. 



Table XVII. Sunshine. — The mean hourly values of the total bright Sunshine 

 for each month : 1st, at Ben Nevis for the 20 years 1884 to 1903 ; 2nd, at Ben Nevis 

 for the 13 years 1891 to 1903 ; and 3rd, at Fort- William for the same 13 years. At the 

 side of each section is given the " total possible " sunshine and the percentage of this 

 possible actually recorded. For Ben Nevis the " possible " is the total time that the 



