December 30, 1922] 



NA TURE 



"EDNEY" 

 THERMOGRAPHS &HYGROGRAPHS 



FOR INDUSTRIAL AND METEOROLOGICAL PURPOSES. 



NEW PATTERN "EDNEY" THERMOGRAPH, with pen worked directly off the thermometric 



coil. Range 0-120 or 30-150 F., mounted on strong metal base, with copper cover, and 



complete with charts for one year, £7. 



See Editorial Notice "NATURE," July 8, page 52. 



IMPROVED "EDNEY" MERCURIAL HYGROGRAPH, giving exact wet and dry bulb readings. 



Range 0-120 or 30-150 F., or to order. Mounted on strong cast-iron base, with copper cover, 



complete with charts for one year, £16: 16s. 



New Illustrated Descriptive List of above and other patterns of Thermographs and Hygrographs, 

 post free from the Sole Manufacturers : 



PASTORELLI & RAPKIN LTD. 



Established 1750. Contractors to various Departments of H.M. Government. 



Actual Makers also of Thermometers, Barometers, Barographs, Hydrometers, and Standard Meteorological Instruments. 



46 HATTON GARDEN, LONDON, E.C.I. 



Any instrument sent on approval if desired. 

 Carriage paid and safe delivery guaranteed of all Instruments within the United Kingdom. 



