§ Major Markhamasked the Secretary of State for Air how many pyrheliometers are now installed in this country and where; whether it is proposed to instal any more in the near future; and what is the initial cost of such instruments.
§ Sir A. SinclairThe only pyrheliometer at present in use by the Meteorological Office is installed at Kew Observatory. Another instrument previously used at Eskdalemuir is awaiting reconditioning. The post-war programme for the measure-2036W ment of radiation may include the installation of two further pyrheliometers. The pre-war cost of a set of instruments for one station was approximately £200.