INTRODUCTION. 



The following tables in continuation of those in Volumes XLII. and XLIII. contain 

 meteorological observations made at the Ben Nevis and Fort William Observatories. 

 The hourly records of the Barometer, Dry and Wet Bulb Thermometers, Eainfall and 

 Sunshine at the two Observatories are printed side by side, those at Ben Nevis 

 being on the left and those at Fort William on the right-hand side. These four 

 subjects are placed first in each year's records, and following them are the hourly 

 values of Wind and of Amount of Cloud at the Ben Nevis Observatory, the 

 Temperature in a Stevenson Screen, .Radiation Temperatures and Amount of Cloud 

 at the Fort William Observatory, Monthly and Annual Mean Hourly Values at the 

 two Observatories, and the Log Book. 



The Barometer and Rainfall are recorded in inches, the Temperatures in degrees 

 Fahrenheit and the Sunshine in hours and decimal parts of an hour. The Wind Force 

 is on the scale to 12, and the Amount of Cloud on the scale to 10, the symbol = 

 denoting fog or mist. All interpolated entries are enclosed in square brackets and are 

 included in computing the daily and hourly mean values. In the Barometer and 

 Temperature tables, the highest and lowest readings, and in the Rainfall and Sunshine 

 tables, the highest only, are printed in bold-faced type. In this volume, the hours of 

 observation are Greenwich Mean Time, except in the Sunshine records in which Local 

 Mean Time is used. 



To save space the first figure of the Barometer entries is omitted. At the Ben 

 Nevis Observatory where the pressure ranges from over 26 to 23 inches, the missing 

 figure is always 2; e.g., 5'212 represents 25-212 inches, and 4753 represents 24753 

 inches. At the Fort William Observatory the whole inches range from 31 to 27, and 

 therefore when the figure before the decimal point in the table is 1 or the missing 

 figure is 3, but when that figure is 9, 8, or 7, the missing one is 2 ; e.g., 0*376 represents 

 30-376; 9727 represents 29727 ; and 8-618 represents 28'618 inches. 



A description of the instruments used at the two Observatories, of the methods of 

 observing, and fuller details of the records will be found in the introduction to volume 

 XLII. 



TRANS. ROY. SOC. EDIN. — VOL. XLIV. A 



