510 REPORT— 1873. 



Appendix to the Report of Subcommittee B. 



The following replies have been received from the various observational 

 institutions communicated with. 



Meteorological Committee. 



Meteorological Office, 

 116 Victoria Street, London, S.W., 

 9th April, 1873. 

 Dear Sib, 

 In compliance with the request contained in your letter of the 28th of 

 February, I am directed by the Meteorological Committee to enclose, for the 

 information of the Observational Subcommittee of the Science-Organization 

 Committee of the British Association, a list of the principal unpublished 

 materials in this office. It is understood that an answer to your second 

 question has been already given in my letter to Dr. Roscoe of April 30, 1872. 

 (See First Report.) Yours faithfully, 



RoBEET H. ScoxT, Director, 

 Balfoiir Stewart, Esq., LL.D., 



The Owens College, Manchester. 



The tabulated information received from the Meteorological Committee 

 will be found at the end of this Appendix. 



Greenwich Observatory. 



Eoyal Observatory, Greenwich, London, S.E., 

 1873, March 3. 

 My deae Sir, 

 In reply to your inquiry (on the part of the British Association) of March 1, 

 as to the extent of unpublished observations of magnetism and meteorology 

 preserved in this observatory : — 



1. You wiU remark that the Greenwich Observations in extenso are in the 

 library of the Philosophical Society of Manchester. Referring you to these 

 volumes for the observations which are published, I will state the following 

 as the deficiencies, generally. 



2. The eye-observations of the three magnetometers (declination, horizon- 

 tal force, vertical force) for every two hours, and sometimes more frequently, 

 from 1841 to part of 184S, are printed in full. The indications derived from 

 the photographic sheets for the salient points of the curves are printed in 

 full from 1849 to 1867 ; after 1867 they are printed in detail only for the 

 days of great disturbance, the means of the less disturbed days for useful 

 purposes being printed. All the photographic curves exist, furnished with 

 the base-lines and the time-scales, which make the records immediately 

 available. 



3. The means of numbers for all dips and measures of absolute force are 

 printed ; the individual readings are not printed. 



4. The abstracts of meteorological observations are printed to an extent 

 which you will best see in the Greenwich Observations. Few of the indivi- 

 dual numbers are published; but the sheets of the two anemometers, the 

 photographic sheets of the two thermometers (wet and dry), and of the 

 barometer are aU preserved and available. 



5. As to the terms on which observations can be communicated. The 

 omitted observations «S:c. can only be copied in manuscript at this place, either 



