CLIMATE 



contributing to the Quarterly Weather Reports of the Registrar-General. 

 The ' Stevenson ' screen affords a complete protection from the effects 

 of radiation by which the thermometers under the ' Glaisher ' screen are 

 cooled below the temperature of the air at night, and of reflection by 

 which those in a ' Glaisher ' screen may be heated above the tempera- 

 ture of the air on sunshiny days. The result is that while the observa- 

 tions at Berkhamsted, St. Albans, and Bennington are strictly com- 

 parable, the greater range of temperature shown at Royston and New 

 Barnet is due, at least for the most part, to the exposure of the ther- 

 mometers and not to any actual excess in the range at these two 

 places. From experiments which have been made with the two kinds 

 of screens it appears that it is only in the range of temperature that they 

 give divergent results, the determination of the mean temperature not 

 being sensibly affected. 



All the observations which are here utilized have been taken at 9 

 a.m., and entered to the day of observation, except the maximum tem- 

 perature and the rainfall which are entered to the previous day. The 

 regulation that the thermometers should be 4 feet above the ground and 

 over grass has in all cases been adhered to. 



The position of the stations, and the names of the observers, etc., 

 are as follows : 



Royston (London Road). Latitude: 52 2' 34" N. Longitude: 

 o i' 8" W. Altitude : 301 feet. Observer : (the late) Hale Wor- 

 tham, F.R.Met.Soc. Rain-gauge 8 inches in diameter, rim 6 inches 

 above the ground. The observations were discontinued on the death of 

 the observer early in the year 1899. The instruments were on the east 

 side of, and not far from the house, the ground sloping down towards 

 the east, and the exposure being sufficiently open. 



Berkbamsted (Rosebank}. Latitude: 51 45' 40" N. Longitude: 

 o 33' 30" W. Altitude : 400 feet. Observer : Edward Mawley, Sec. 

 R.Met.Soc. Rain-gauge 8 inches in diameter, rim i foot above the 

 ground. The instruments are some distance from the house on ground 

 sloping down towards the south-west, the situation being quite open. 

 There are numerous meteorological instruments, including several which 

 are self-recording, this being one of the most perfectly equipped meteoro- 

 logical observatories in this country. 



St. Albans (The Grange}. Latitude: 51 45' 9" N. Longitude: 

 o 20' 7" W. Altitude : 380 feet. Observer : John Hopkinson, F.R. 

 Met.Soc. Rain-gauge 5 inches in diameter, rim i foot above the 

 ground. Full particulars of this station, a very open situation, with a 

 complete record of the observations from 1887 to 1896, have been 

 given by the observer in a paper on ' The Climate of St. Albans ' in 

 the Transactions of the Hertfordshire Natural History Society (vol. ix. pp. 

 215-228). The observations were discontinued here early in the year 

 1900 owing to the removal of the observer from St. Albans to Wat- 

 ford. They are continued at the Hertfordshire County Museum, St. 

 Albans, to which institution the thermometers, thermometer-screen, and 



35 



