XXxiv REPORT — 1855. 



" 26. Evaporation-Gauge, invented by Francis Ronalds, F.R.S, and em- 

 ployed at the Kew Observatory. 



" 27. Rain-Gauge, with graduated Glass-measure. 



" 28. Portable Apparatus, for the determination of heights by observation 

 of the boiling-point of water. Constructed on the principle of Regnault's 

 Boiling-point Apparatus for the Kew Observatory. 



" 29. Meteorological Instruments employed in the experimental Balloon 

 ascents performed in 1852, under the direction of the Kew Observatory 

 Committee, at the expense of the Royal Society of London. 

 " 30. Portable Robinson's Anemometer. 



"31. Sliding-rule for the computation of the results of observations of the 

 dry- and wet-bulb hygrometer. Designed by J. Welsh, of the Kew Ob- 

 servatory. 



" 32. Sliding-rule for computing the variations of the dip and total intensity 

 from observations of the horizontal and vertical components of magnetic 

 intensity. Designed by J. Welsh, of the Kew Observatory. 



"33. Apparatus similar to that employed at the Kew Observatory, in 

 the verification of the thermometers supplied to ships by the British and 

 American Governments. 



" 34. Specimens of the Photographic Records of the Self-registering Mag- 

 netometer and Barometer, with apparatus for measuring the ordinates of the 

 curves." 



The cost and expenses incurred in the preparation and transit of the 

 instruments and apparatus sent to the Paris Exhibition having exceeded the 

 amount of £140 received from the Board of Trade, and Mr. Welsh having 

 strongly recommended that some arrangement should be made for increased 

 inspection of the instruments and apparatus during the time they remain in 

 the Exhibition, — 



The Committee Resolved, — That the Chairman be requested to forward an 

 account of the expenses incurred, amounting to £141 45. Id., with 

 vouchers, to the Board of Trade, and a list of the instruments exhibited, 

 requesting that a further sum of £50 be granted in order to defray the 

 expenses that must be incurred in repacking and forwarding the instru- 

 ments to England ; and that a copy of the above, and of this Resolution, 

 be sent to the Royal Society's Paris Exhibition Committee, requesting its 

 support of the application. 



A copy of the above Resolution, with a list of the apparatus deposited in 

 the Exhibition, has been forwarded to Dr. Lyon Playfair and to the Royal 

 Society. 



The apparatus for testing barometers has been completed, and is now in 

 action. This apparatus has been entirely constructed in the Observatory by 

 Mr. Beckley, under the direction and superintendence of Mr. Welsh. 



In their last report, the Committee stated that they had engaged to verify 

 for the Board of Trade 400 thermometers and 60 barometers, and for the 

 United States Navy 1000 thermometers and 50 barometers, all of which 

 instruments have now been despatched from the Observatory. The Com- 

 mittee have since undertaken the verification of the following additional in- 

 struments, viz. 



For the Board of Trade. For the Admiralty. 



Thermometers 400 480 



Barometers 60 80 • 



Hydrometers 600 400 



Of which there have been already completed 540 thermometers, 800 hydro- 



