58 



Mr. R. H. Scott. 



In the same year the Kew Heliograph was completed, arid it was 

 arranged that Mr. Welsh should undertake the Magnetic Survey of 

 Scotland, the results of which operation were published by Mr. Stewart 

 in the Report of the British Association for 1859. In 1858 also Mr. 

 G. M. Whipple was engaged as a boy. 



In ] 859 Mr. Welsh died, and was succeeded by Mr. Balfour Stewart. 

 At this date an instrument had been devised at the Observatory for 

 tabulating the values of the magnetic elements from the magneto- 

 grams, and as the staff of assistants at the Observatory was not 

 sufficiently large to undertake these tabulations, General Sabine 

 undertook to have the results tabulated at Woolwich for every hour. 



In 1860 the Kew Photoheliograph was taken by Mr. de la Rue, 

 mainly at his own expense, to Spain, for employment at the Solar 

 Eclipse on July 18th. Its use was a complete success, and proved 

 that the red prominences belonged to the sun. 



In 1861 Sir W. Thomson's Electrograph was brought into regular 

 operation at Kew, and an account of two years' work with it was 

 prepared and submitted to the Royal Society by Professor J. D. 

 Everett in 1868. 



In 1862, at the suggestion of Admiral Fitz Roy, who agreed on the 

 part of the Meteorological Department of the Board of Trade to bear 

 the expense incurred, the Barograph designed by Mr. Ronalds was 

 fitted up, and has been from that date kept in constant operation. 



It was also reported that as on account of the inadequate strength 

 of the staff of assistants it was not possible to work the Photo-Helio- 

 graph at Kew, it- had been in operation at Mr. de la Rue's observa- 

 tory, at Cranford, since February 7th. The instrument remained in 

 Mr. de la Rue's hands for twelve months, when it was re-erected at 

 Kew. 



In 1862 Mr. Stewart communicated to the Royal Society an account 

 of some experiments made at Kew in order to determine the increase 

 between 32° Fahr. and 212° Fahr. of the elasticity of dry atmospheric 

 air the volume of which remains constant ; and also of others to 

 determine the freezing-point of mercury. 



In the next year Mr. Chambers left the Observatory to enter the 

 India Telegraph Service, and eventually to take charge of the Colaba 

 Observatory, Bombay ; his place, as Magnetic Assistant, being filled 

 by Mr. Whipple. 



In 1865 we hear that the Indian Government having decided that 

 pendulum observations should be made in India, Col. Walker and 

 Capt. Basevi received instruction at Kew. A convenient room for 

 pendulum observations was likewise fitted up in the Observatory, the 

 expense being defrayed from the Government-Grant Fund of the 

 Royal Society ; and in this room preliminary observations were made 

 for determining the constants of the two pendulums about to be 



