1 REPORT — 1870. 



Staff, at the suggestion of the Meteorological Office, have undertaken to rule 

 on the Barograms and Thermograms a set of zero lines, which are of great 

 use in Pantagraphic operations. 



Mr. lligby continues to perform the main part of this -work ; Mr. Baker, 

 Meteorological Assistant, having the general superintendence of the de- 

 partment. 



3. Occasional Assistance. — The Meteorological Committee have availed 

 themselves of the permission to have the occasional services of Mr. Beckley, 

 Mechanical Assistant at Kew ; and ho has lately been visiting the various 

 observatories of the Meteorological Committee. 



The Self-recording Eaiu-gauge mentioned in last Eeport as having been 

 devised by Mr. Beckley has been adopted by the Meteorological Committee, 

 and instruments of this kind are at present being constructed for their various 

 Observatories. 



The Staff at Kew continue to make occasional absolute hygrometrical ob- 

 servations by means of Eegnault's instrument, "with the view of testing the 

 accuracy of the method of deducing the dew-point from the observations with 

 the dry- and wet-bulb thermometers. 



Two erections have been made in the grounds adjoining the Observatory ; 

 and on one of these a large Robinson's Anemometer is placed, while a small 

 instrument of the same kind is placed on the other. 



By this means the indications of the large and those of the small-sized 

 instrument may be compared with each other. The cost of this experi- 

 ment has been defrayed by the Meteorological Committee. 



J. P. GASSIOT, 

 Kcw ObseiTatoi-y, Chairman, 



yth September, 1870. 



Appendix to Keio Report of 9th September, 1870. 



At the Meeting of the Kcw Committee held at Burlington House on 2nd March 

 1870, it was Resolved that the remarks by Sir E. Sabine and Mr. Stewart 

 be printed, along with extracts from the Eeport for 1866-G7, and from 

 the Minutes of June 18, 1869 ; and that copies be forwarded to the 

 several Members of the Committee, with a statement by Mr. Stewart 

 as to the manner in which he proposes to complete the reductions, so as 

 to carry out the Resolutions of the Committee. 



No. 1. 



Memorandum by General Sir E. Sabino regarding the Investigations for 

 v/hich the loan of the Kew Photograms from 1857 to 1862 was re- 

 quested. 



March 1, 1870. 

 The photograms here referred to were duly received at Woolwich, and duly 

 returned to Kcw ; Mr, Gassiot has a paper stating the dates at which the 

 several photograms were returned to Kew. 



The investigations for which these documents were temporarily borrowed 

 formed the substance of a paper presented to the Royal Society in June 1863, 

 and printed in the Philosophical Transactions of that year (Art. XII.). The 



