I. SPECIAL COLLECTIONS. 565 



WET BULB THERMOMETER, MAXIMUM THERMOMETER, and MINI- 

 MUM THERMOMETER. 



RAIN GAUGE. 



BLACK and BRIGHT BULB THERMOMETER in vacuo, for deter- 

 mining the intensity of solar radiation. 



MINIMUM THERMOMETER for determining the intensity of 

 terrestrial radiation. 



ANEMOMETER. 



With specimen forms, instructions for taking, and tables for 

 reducing the observations. 



Publications of the Meteorological Society: 

 Reports of the Council, 1851 to 1861. 

 Proceedings, Vols. I. to V., 1861-1871. 

 Quarterly Journal, Vols. I. and II., .1872-1875. 

 List of Fellows, January 31st, 1876. 

 Catalogue of the Books in the Library, December 31st, 



1875. 



Instructions for the observation of phenological phenomena, 

 charter, and byelaws. Meteorological Society. 



2784. Instruments used at the Russian Meteorological 

 Stations. A specimen set. 



Wild's adjustable syphon barometer, No. 45, with screw for 

 suspension and key for valve. 



Three thermometers by Greisler, dry bulb and wet bulb, No. 244, 

 minimum No. 138 ; in cylindrical paste-board cases. 



Thermometer-screen, No. 141, made of zinc, to revolve round 

 its vertical axis, carrying the above thermometers, 



Saussure's hair hygrometer, No. 9, in box. 



Russian rain and snow gauge, with glass measure, &c., No. 118. 



Wild's anemometer of iron, for observing direction and pressure 

 of wind. Meteorological Committee of the Royal Society. 



2786. Meteorological Instruments, made under the direc- 

 tion of the late Sir John Leslie, and used by him. 



Scottish Meteorological Society. 



1. Portable Hygrometer (with specimen of Sir J. L.'s writing;. 



2. Stationary Hygrometer. 



The covered ball in both cases being wetted and exposed to evaporation, 

 the liquor soon marks, by its descent in the opposite stem, the dryness of 

 the air. 



3. Leslie's Atmometer. It consists of a ball of thin porous earthenware, to 

 which is cemented a wide glass tube, bearing divisions which correspond each 

 to the measure of a film of water that would cover the external surface to the 

 thickness of the thousandth part of an inch. 



