M. Gersu-d's Meteorological Register for Kotgurli. 139 



Average duty 38.2 millions of lbs. lifted a foot high by the 

 consumption of each bushel of coal. 



Watt''s (double) rotatory engines working machines for 

 bruising tin ores at 



HuelVor, 24 6. 6. 12. 16.8 18.2 



27 5. 5. 12.5 18.2 21.5 . 



16.5 5. 5. 8.5 25.8 14.3 



Average duty of rotatory (double) engines, 1 8 millions. 



* Engines thus distinguished are Watt's double. 



•f Those thus noted receive the steam first into a high pres- 

 sure cylinder, whence it passes to a Watt's single engine, the 

 pistons of both cyhnders being connected with the same lever. 



All the others in the preceding list are Watt's single en- 

 gines. 



Art. XIX. — Abstract of a Meteorological Register kept at 

 Rampoor and Kotgurh, in January, February, and March 

 1822. By Captain Patrick Gerard, of the Bengal Na- 

 tive Infantry. Communicated by the Author. 



The observations from which the following general results 

 are deduced were made at Rampoor and Kotgurh. 



Rampoor is situated fourteen English miles north east of 

 Kotgurh, and 3398 feet above the level of the sea. 



Kotgurh is situated in north latitude 31° 19', and east 

 long. 77° 30', at the height of 6634 feet above the sea. 



All the barometrical observations were made at Kotgurh, 

 and the thermometrical ones were made between January 18th, 

 and 31st, inclusive, and between February 10th and March 

 31st. The observations at Rampoor were only those with the 

 thermometer and on the weather, and were made on the first 

 17 days of January, and the first 9 days of February. 



January 1822. 

 Barometer.— Max. 23.700. Jan. 23; wind E.— Min. 23.520, 

 Jan. 28 ; wind W. 

 Range of mercury, .180, 

 Mean of observations, 23.624. 



