REPORT OF THE KEW COMMITTEE. XXX: 



been sent ; and an apparatus similar to that employed here in the verification 

 of thermometers has been constructed, and is exhibited in working order. 



" The meteorological instruments made use of in the balloon ascents of 

 1852 were put in order, and arranged for exhibition exactly in the condition 

 in which they were employed in the ascents. 



" The following instruments were made by my direction expressly for 

 the Exhibition : — 



" An Evaporation-gauge on the principle of Mr. Ronalds. 



" A common circular Rain-gauge. 



" A portable Boiling-point apparatus (the thermometer graduated by 

 myself), on the principle of Regnault's large instrument. 



" At the request of the Committee, Mr. Adie furnished a specimen of the 

 marine barometers constructed by him, and recommended by the Committee 

 to the British and American Governments. Messrs. Negretti and Zambra, 

 and Messrs. Casella and Co., also furnished specimens of the marine thermo- 

 meters constructed by them under the superintendence of the Committee. 



" In order to render the collection of meteorological instruments more 

 complete, the Committee requested instruments to be sent by the following 

 London opticians, viz. — 



" By Mr. Newman, a Standard and a Portable Barometer. 



" By Mr. Barrow, a Standard Barometer ; and 



" By Mr. Adie, a Standard and a Portable Barometer, and a Portable 

 Robinson's Anemometer. 



" The instruments having been prepared and collected at Kew, glass 

 cases and other fittings required for their proper exhibition and protection 

 were constructed, and the whole packed and forwarded on April 10th to the 

 shipping agents appointed by the Board of Trade, by whom they were 

 transmitted to Paris. 



" Having learned that the instruments had arrived in Paris, and that the 

 space allotted for their exhibition was in readiness ; on May 9th, accompanied 

 by Mr. Beckley, I proceeded to Paris for the purpose of arranging the Col- 

 lection. Owing to certain arrangements of the Imperial Commissioners, I 

 could not proceed with the necessary preparations until the 17th of May. 

 On June 2nd, the instruments having been all put in order, we returned to 

 the Observatory. 



" The space assigned to the Kew Collection is situated near the middle 

 of the South Gallery in the Central Building. It consists of a counter space 

 25 feet long, and an open space 25 feet long by 7 feet wide. On the counter 

 are placed two glass cases, each 10 feet long, the one containing the smaller 

 Magnetical Instruments, and the other the Meteorological Instruments. On 

 the counter are also placed Mr. Ronalds's Self-registering Magnetograph, and 

 the apparatus for the verification of thermometers. 



" On the open space are placed the three large Magnetical Instruments 

 used in the Colonial Magnetical Observatories, with the Reading Telescopes, 

 supported by wooden Tripod Stands; the Self-recording Barometer and 

 Electrical Insulator of Mr. Ronalds ; and the Kew Thermometer Stand. 



" There is also on this space a Stand containing a copy of the Magnetical 

 and Meteorological Observations made at the British Colonial Observatories, 

 surmounted by Mr. De la Rue's model of the Tower proposed to be erected 

 at Kew for the Huyghenian Telescope. 



" The various instruments, especially the magnetical, have been put, as 

 far as was practicable, in a state of approximate adjustment. In order to 

 avoid the effect of tremor in the floor, the magnets have been supported on 

 blocks in such a way as to render the scales visible. All the instruments 



