Report of the Kew Committee. 



373 



The eye-observations of the sun, after the method of Hofrath Schwabe, 

 have been made daily by Mr. Foster, when possible, as described in the 

 Eeport for 1872, in order, for the present, to maintain the continuity 

 of the Kew record of sun-spots. 



A catalogue of the Schwabe MSS., deposited in the Obseryatory, has 

 been made for the Eoyal Astronomical Society. 



Extra Observations. — The observations with Prof. H. E. Eoscoe's 

 Photometer were discontinued in November last, the year for which the 

 experiment was undertaken having expired. The instrument has since 

 been returned to the Owens College. 



The Solar-radiation Thermometers are still observed daily. 



The Campbell Sundial, described in the last Eeport, continues in 

 action, and the improved form of the instrument, giving a separate record 

 for every day of the duration of sunshine, has been regularly worked 

 since March. 



At the request of the Editor of the ' Times,' a copy of the traces of 

 the self-recording instruments on a reduced scale, together with an 

 epitome of the general features of the weather, is now prepared. This 

 is published every week in that journal, the cost to the Observatory being 

 defrayed by the proprietors. 



Verifications. — A fair increase has occurred in this branch of the work 

 of the Observatory. The following magnetic instruments were 

 verified : — 



A TJnifilar for Lieut. TVille, Norwegian Navy. 



„ „ The Eoyal Naval College, Greenwich. 

 „ „ Elliott Brothers, London. 

 A Dip-circle „ Lieut. Wille, Norwegian Navy. 



„ „ Captain Jelagin, St. Petersburg. 

 A Fox-circle „ Lieut. Wille, Norwegian Navy. 

 A pair of Dipping-needles for Dr. Eijckevorsel, Batavia. 

 „ „ „ Mr. Meldrum, Mauritius. 



„ „ „ Senhor Capello, Lisbon. 



A Dipping-needle „ Mr. Chambers, Colaba. 



A set of three Magnets for Zi-ka-"Wei Observatory. 

 A Dip-circle of a high degree of accuracy has been obtained, and 

 after verification forwarded to Dr. Da Souza, Coimbra ; and a similar 

 instrument, having an accessory telescope fitted to enable it to be used 

 as an altazimuth, has been purchased and verified for the Zi-ka-Wei 

 Observatory. 



The Magnetographs ordered by Dr. C. H. Vogel for the Potsdam 

 Astroph3^sical Observatory have been constructed, but before verifica- 

 tion were lent by Dr. Vogel to the South-Kensington Loan Exhibition, 

 where they are now being exhibited, in a building erected specially by 

 the Commissioners for the purpose. 



A set of Magnetographs, constructed in 1860 for the Batavia Ob- 



