METEOROLOGY. 3J5 



EXPLArsATION OF EXTERNAL VIEW OF THE OBSERVATORY. 



A. Thermometer for solar radiation. 



B. Screen of Venetian blinds. 



C. Thermometers. 



D. Opening in ridge of the roof, closed with shutters, to allow use of transit instrument. 



E. Kain gage with conducting pipe through the roof. 



F. Velocity shaft of the anemometer. 



G. Mast for elovatiog apparatus for collecting electricity. 

 H. Cord for hoisting the collecting apparatus. 



I. Copper wire for conducting the electricity into the building. 

 J. Direction shaft of the anemometer. 



EXPLAX.\T10X OF THE PLAN OF THE OBSEKVATORY. 



A. Anemometer. 



B. Small transit for correcting time. 



C. Electrical machine for charging the distiuguisher. 



D. Peltier's electrometer. 



d. Space occupied ly drosometer, polariscope, &c 



E. Electrometer, e. Dischaiger. 



F. Disticguisher. 



f. Small stove — sometimes used in damp weather. 



G. Thermometer placed iu the prismatic spectrum for investigations in light. 



H. Nigretti «fc Zambra's b'lrometers and cisterns, 118 feet above the level of the sea. 



I. Small-tube barometer. 



J. Newman's barometer. 



K. Aneroid barometer. 



L. Quadrant and artificial horizon, 



M. Microscope and apparatus for ascertaining the forms of snow crystals. 



N. Thermometer, psychometer, &c . 4 feet high. A space is left between the two walls to 

 insure insulation and prevent radiation. 



O. Ozonometer. 



P. Evaporator— removed in winter and replaced by scales for showing the amount of evap- 

 oration from the surface of ice. 



Q. Post sunk in the ground, and 40 feet high, to carry the arms of support for ihe ane- 

 mometer. 



R. Solar radiator. 



S. Venetian blinds. 



T. Iron rod beneath the surface of the ground connected with the discharger to insure 

 safety. 



