45, CORNHILL, E.G., AND 122, REGENT STREET, W., LONDON. 125 



One Solar Eadiation Thermometer, with Exposed Bulb. 



One Terrestrial Radiation Thermometer. 



One Glaisher's Eain Gauge, Copper, complete. 



One Anemometer, with two dials. 



One Wet and Dry Bulb Hygrometer. 



One Stevenson's Thermometer md Hygrometer Stand. 



Cost for the above Set of Apparatus, 22 to 25. 



No 2 Set of Apparatus is strongly recommended to private observers 

 where complete and regular observations are taken of Barometric Pressure, 

 Temperature, Humidity, Rain, Wind, and Electrical phenomena. 



The series can be reduced to form a Third Class set at 12 12s., where 

 only a few of the more important meteorological observations are taken, or 

 other instruments can be added to meet the requirements of the observer. 



It will be as well to note here that all observations should be made 

 punctually at fixed hours. The Meteorological Office recommend that, at 

 Observing Stations of the second order, observations be made at least twice a 

 day, at homonymous * hours, for which 9 a.m. and 9 p.m. (local time), have 

 been most generally approved of. In unsettled weather occasional observations 

 should be made of any special meteorological facts that may occur. 



VERIFICATION OF STANDARD METEOROLOGICAL 

 INSTRUMENTS. 



178. The Kew Committee of the Royal Society undertaking the testing 

 and verification of Meteorological Instruments by their Standards, Negretti and 

 Zambra subjoin a list of the charges. At the same time, Negretti and Zambra 

 would observe that, having absolute Standard Instruments of their own 

 manufacture which have been compared both with Greenwich and Kew 

 Observatory Standards, they are prepared to compare and give certificates 

 with their own instruments free of charge, 



The Kew Committee wish it to be noted that they do not undertake the 

 verification of inferior instruments, such as Barometers mounted on Wood 

 Frames, and Thermometers not graduated on the Stem, and also that the 

 Superintendent may at his discretion decline to receive instruments he may 

 consider unfit for Scientific observation. 



Each. 



Standard Barometers with attached Thermometer 10s. 6d. 



Marine Barometers in Metal Mountings 15s. Od. 



Aneroid Barometers for Altitude Measurements compensated . . 15s. Od. 



Thermometers 2s. 6d. to 5s. Od. 



Eain Gauges 2s. 6d. 



* The term " homonymous " signifies hours of the same name, as 9 and 9, or 12 and 12. The most 

 suitable hours are, to a certain extent, to be determined by the locality and climate. 



