450 Miscellaneous Intelligence. 



apparatus on board for the purpose of blowing them up. Tor-> 

 pedoes of an arrow form are thrown from a gun on board the 

 vessel, which are calculated to sink into the body of the whale^ 

 and there explode. 



] 2, Terrestrial Globe in Relief. — Charles P. Khummer, of 

 Berlin, has lately published a globe, on which the mountains 

 are beautifully executed in relief. It is admirably calculated 

 for communicating permanent and accurate ideas of the distri- 

 bution and grouping of the great ranges of mountains and table 

 lands in the different quarters of the globe. There are globes 

 of this description of different sizes and prices. Globe, 16 

 inches diameter, eight dollars without names ; with names, 

 eleven dollars. Globe, 26 inches diameter, 25 dollars without 

 names ; with names, degrees, and finely finished, fifty dollars. 



13. Light-House. — A new light-house is erecting at the Tour 

 des Baleines, Isle of Rhe. The light will make one revolution 

 in six minutes. In the interval there will be four appearances of a 

 white and very brilliant light. At each interval of 90 seconds a 

 very sparkling lustre will be seen for about fifteen seconds, and 

 will gradually diminish till it disappears. 



The board of the Marine in Sweden has recently published a 

 notice, announcing that the light-house of the Tower of Carlsten, 

 near Marstrand, will be pulled down and rebuilt in the course 

 of 1822. The execution of this project to commence April 

 16th, 1821, and the flame to be extinguished from the 15th 

 of the same month. 



14. Mathematical Prize Question. — The class of mathematics 

 of the Royal Academy of Sciences of Prussia, has proposed 

 the following question : — '* To give a mathematical explanation 

 of the luminous and coloured rings, which are sometimes 

 observed round the sun and moon, agreeing with experiments 

 on light and the constitution of the atmosphere, and with 

 observations of the phenomena, made with all the precision 

 possible." The memoirs to be sent in before the expiration of 



