Xll 



INTRODUCTION. 



B from 6h. 30m. to lOli. 30m. p.m., C from lOh. 30m. p.m. to 2h. 30m. a.m., A from 2h. 30m. 

 to 6h. 30m.' a.m., and so on. The term days were the 1st and 15th of each month ; on 

 these days the magnetic instruments were read every five minutes, and in addition the 

 declinometer was read every 20 seconds, for a selected hour. 



The Magnetic Observatory was finished about the 14th September, and a new building 

 for absolute magnetic observations was commenced and completed by the middle of October. 

 This Observatory was also used for the transit instrument, the roof being provided with 

 shutters in the meridian. 



/ PLAN 



Shevuimc arrangement of Meteorolochcal''' Instruments. 



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■ AnEIBO METER,' 





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Unfinished 

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^GauCC • CAFITH THCRHOHETCIIS'-' 



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40 Feet to ome^'Imch. 



Heights in Feet above mean level of lake,/ Contours at I- vertical interval. 



Fig. 3. 



Only one observer being as a rule available both for magnetic and meteorological observa- 

 tions, the meteorological instruments were placed, as shown in annexed plan (Fig. 3), near to 

 the Magnetic Observatory. They were read at each hour in the following order : — barometer, 

 anemometer, dry and wet bulb thermometer, hair hygrometer, wind, clouds, weather, and 

 aurora. The self registering thermometers were read at 9 a.m. every morning, and at the 

 same hour the amount of rain or snow in the rain gauge was recorded, and on alternate 

 days the readings of the earth thermometers. The solar radiation thermometer was read at 

 the first hour after sunset. 



