XXXV11 



netical and meteorological instruments, showing the advanced state 

 of those sciences in this country, should be sent to the Paris Exhi- 

 bition, Mr. Welsh was requested to proceed to Paris with the instru- 

 ments and to superintend the arrangements. An account of the 

 instruments appears in the Report of 1855 of the Kew Committee. 

 In the ' Philosophical Transactions' for 1856 there is a paper of 

 Mr. Welsh's entitled " Mi Account of the Construction of a Standard 

 Barometer, and Description of the Apparatus and Processes em- 

 ployed in the Verification of Barometers at the Kew Observatory ;" 

 and in the * Proceedings of the Royal Society/ vol. vi., a Report of 

 the general process adopted in graduating and comparing the 

 Standard Meteorological Instruments for the Kew Observatory ; 

 also a Report of the graduation of Thermometers supplied from the 

 Observatory for the use of the Arctic Searching Expedition under 

 Sir Edward Belcher. 



In January 1856, a series of monthly determinations of the abso- 

 lute magnetical force, and of the magnetic dip, was commenced at 

 the Observatory by Mr. Welsh, with instruments provided by General 

 Sabine from his department at Woolwich ; and in the same year a 

 set of self-recording magnetometers were constructed : these were 

 arranged in the basement of the Observatory, and have been in action 

 since January 1858. In the Report of the British Association for 

 1856, Mr. Welsh described a process for the graduation of boiling- 

 point thermometers intended for the measurement of heights. 



In 1857 Mr. Welsh was elected a Fellow of the Royal Society a 

 position, to which his qualifications fully entitled him to aspire, but 

 which his natural diffidence would have led him to postpone, had it 

 not been urged on him by those who appreciated his merits. To 

 his personal friends he always spoke with feelings of gratitude of the 

 mode in which his services to science had been thus recognized. 



Twenty years having elapsed since the execution of the Magnetic 

 Survey of the British Islands, it was determined by the British 

 Association that another survey should be made. With this view, a 

 Committee, consisting of the same five members by whom the former 

 survey was conducted, with the addition of Mr. Welsh, was appointed, 

 and Mr. Welsh undertook the Magnetic Survey of the North British 

 division of the United Kingdom. In the summer of 1857 he deter- 

 mined the magnetic elements at thirty-one stations, and in the summer 



