Intelligerice and Miscellaneous Articles. 235 



LECTURES. 



A Course of Lectures on the Sources and Nature of Terrestrial 

 Heat and Light will be commenced at the Russel Institution, on 

 the 5th of March ; by E. W. Brayley, jun. A.L.S. This course will 

 comprise experimental illustrations of the phsenomena of combustion, 

 incandescense, phosphorescence, the evolution of heat and light by 

 common and voltaic electricity, and luminous animals. 



ACCOUNT OF STEAM-ENGINES IN CORNWALL. 

 'Extracted from the Monthly Account for December 1826. 

 The whole number of engines reported in the month was, 

 53 Pumping Engines, K Whim Engines, 3 Stamping Engines. 

 Of the pumping engines 50 are single and 3 double power, and 

 3 of the single power engines have combined cylinders ; the dia- 

 meters of the cylinders as under: 



Engines. Inch. Bushels, 



of coals consumed in the month 11864< 

 do. do. 10332 



do. do. 2660 



do. do. 16078 



do. do. 1368 



do. do. 9507 



do. do. 11798 



do. do. 5899 



do. do. 5111 



do. do. 10M< 



do. do. 1083 



do. do. 4.498 



do. do. 1010 



do, do. 630 



do. do. 2619 



do. do. 1310 



do. do. 1080 



do. do. 1080 



53 88971 



Relative duty of the pumping engines expressed by the number of 

 millions of pounds of water If ted one foot by each bushel of coal. 



Greatest duty 47 millions nearly by 1 engine 60 inch cylinder. 



41 do. by 1 do. 80 do. 



40 do, by 1 do. 90 do. 



39 do. by 1 do. 76 do, 



38 do, by 2engines 63& 70 do. 



36 do. by 3 do, 2 of 80 & 1 of 63 do. 



36 to 34 do. by 4 do. 



34 to 30 do. by 5 do. 



under 30 do. by 2S do. 

 duty not reported 7 



2H2 



53 



