XXxiv REPORT — 18G6. 



the Kew C!ominittee, the result of which is that the Committee have super- 

 intended the consti-uction of an Anemometer, a Dip Circle, and a TJniiilar 

 for the Bombay Observatory. These instruments have been verified, and are 

 now in the hands of the India Board for transmission to their destination. 



The Admiralty have ordered a Unifilar and a Dip Circle for Captain Mayne, 

 of Her Majesty's ship ' Nassau,' who is about to proceed to the Straits of 

 Magellan ; these instruments have been verified at Kew Observatory, where 

 Captain Mapie and several of his officers have likewise received instruction 

 in magnetism. 



Dr. Buys-Ballot has ordered a Declination Magnetograph, which has been 

 constructed by Mr. Adie, and forwarded to Utrecht, where it has safely 

 arrived. 



A set of Self-recording Magnetographs and also a Barograph have been 

 ordered by the Stonyhurst Observatory ; and the Rev. "Walter Sidgreaves has 

 been at the Observatory receiving instruction in magnetism. The Self- 

 recording Magnetographs for Stonyhiirst have been verified and dispatched 

 to their destination. 



The set of self-recording instruments ordered by Mr. Meldrum of the 

 Mauritius Observatory, are at present at Kew ; Mr. Meldrum intends to visit 

 the Kew Observatory for the purpose of making himself further acquainted 

 with the process of observing and deducing results previous to his return 

 to the Mauritius. 



Mr. Ellery, of Melbourne Observatory, has likewise- ordered a set of Self- 

 recording magnetographs. These have been constructed bj" Mr. Adie, and 

 will be taken to Kew for verification when the set for Maui'itius have been 

 removed. 



Professor Smimow (from Kasan) has received instruction in magnetism at 

 the Observatory. 



The usual monthly absolute determinations of the magnetic elements con- 

 tinue to be made by Mr. Whipple, Magnetical Assistant, and the self-recording 

 magnetographs are in constant operation as heretofore, also imder Mr. Whipple, 

 who has displayed his usual care and assiduity in the discharge of his duties. 



The photographic department connected with the self-recording instru- 

 ments is under the charge of Mr. Page, who performs his duties very satis- 

 factorily. 



A stoneware stove free from iron has been erected in the room containing 

 the Kew magnetographs, and by its means this room has been heated through 

 a range of 20° Fahr., in order to determine the temperature correction of the 

 horizontal and vertical force magnetographs. The observations for this pur- 

 pose are being reduced. 



The meteorological work of the ObseiTatoiy continues in charge of Mr. 

 Baker, who executes his duties very satisfactoiily. 



Since the Birmingham Meeting 126 barometers have been verified. 

 395 thermometers have likewise been verified, and 8 standard thermometers 

 constructed at the Observatory. 



The Self-recording Barograph continues in constant operation ; and traces 

 in dupHcate are obtained, one set of which is regularly forwarded to the 

 meteorological department of the Board of Trade. 



An arrangement for a Self-recording Thermograph has been devised by the 

 Superintendent and by Mr. Beckley, and, as a preliminary experiment, gave 

 a very satisfactory curve ; the instrument is now being arranged in a suitable 

 site. 



The instruments used by the late Mr. Appold for regulating the tempera- 



