REPORT OP THE KEW COMMITTEE. :«Xxm' 



« 6. Portable Unifilar Magnetometer, for observation of deflection in the 

 determination of the absolute horizontal intensity by the method of Gauss. 

 Constructed by W. H. Jones of London. 



" 7. Portable Vibration Ai)paratus (to accompany the Unifilar Magneto- 

 meter), for observations of the time of vibration of the deflecting magnet in 

 experiments for the absolute horizontal intensity, with brass rings for the 

 determination of the moment of inertia of the magnet and its appendages. 

 Constructed by W. H. Jones of London. 



" 8. Portable Declinometer, with Theodolite and Collimator Magnet, for 

 observation of the absolute declination. Constructed by W. H. Jones of 

 London. 



" 9. Universal Unifilar Magnetometer, for observations of deflection and 

 vibration in experiments for the absolute horizontal intensity, and (with the 

 addition of a Theodolite) of the absolute declination. Constructed by W. H. 

 Jones of London. 



" 10. Portable Declinometer, for observations of the variations of the 

 magnetic declination. Constructed by W. H. Jones of London. 



"11. Portable Bifilar Magnetometer, for observations of the variations of 

 the horizontal intensity. Constructed by W. H. Jones of London. 



" 12. Self-registering Magnetometer, for recording photographically the 

 variations of the horizontal magnetic intensity, or of the magnetic decli- 

 nation. Invented by Francis Ronalds, Esq., F.R.S., and constructed under 

 his direction for the Kew Observatory. 



" 13. Self-registering Barometer, for recording photographically the 

 variations of the atmospheric pressure, with mechanical compensation for 

 the effect of temperature. Invented by Francis Ronalds, Esq., F.R.S., and 

 constructed under his direction for the Kew Observatory. 



" 14. Apparatus to illustrate the methods of Insulation and Observation 

 employed in the Atmospheric Electrometer, constructed for the Kew Ob- 

 servatory, under the direction of Francis Ronalds, Esq., F.R.S. 



" 15. Thermometer Stand for Meteorological Observations, similar to that 

 employed at the Kew Observatory ; furnished with — 



A. Dry- and Wet- bulb Thermometers. 



B. Regnault's Condensing Hygrometer, with the Inverting Aspirator 



of Mr. Ronalds. 



C. Daniell's Dew-point Hygrometer. 



D. Negretti and Zambra's Maximum-Thermometer. 



E. Phillips's Maximum-Thermometer. 



F. Rutherford's Minimum-Thermometer. 

 " 16. Standard Barometer by Newman. 



" 17. Standard Barometer by Barrow and Co. 



" 18. Standard Barometer by Adie. 



" 19. Portable Barometer by Newman. 



" 20. Portable Barometer by Adie. 



"21. Marine Barometer by Adie, London, supplied to ships by the 

 British and American Governments, on the recommendation of the Kew 

 Observatory Committee. 



" 22. Cistern of Adie's Standard or Portable Barometer. 



" 23. Cistern of Newman's Portable Barometer. 



" 24'. Standard Thermometers graduated at the Kew Observatory by 

 i, Welsh. 



" 25. Thermometers for Marine Meteorological Observations, supplied to 

 ships by the British and American Governments, on the recommendation of 

 the Kew Observatory Committee. 



1855. c 



