Foreign Literature and Scie^ice. 189 



Si. Sigiialsfor a great distance, — Schumacher, a captain 

 of artillery, has invented a Rocket whicli may become of 

 great use to astronomers, and geographers. They have a 

 much greater force than the Congreve rockets, and ascend 

 to a prodigious heighth. When at their greatest elevation 

 they explode, and produce in the air a volume of light, so 

 strong, and clear as to be distinctly perceived at a distance 

 of 30 leagues. The inventor placed himself in the httle 

 Island of Hiveen, in the Cattegat, and launched his rockets; 

 while his brother posted himself at the observatory of Co- 

 penhagen, to notice the effect. Though the distance is 

 nearly 30 leagues, he saw, by means of a telescope, the ex- 

 plosions appear and disappear, resembling stars of the first 

 magnitude. It is impossible to imagine signals more beau- 

 tiful, or more expeditious for great distances. Idem. 



32. Merino sheep^ and icool. — A number of Merino 

 sheep, and a quantity of wool, were sold at the Rural, and 

 Royal estahhshment of Rambouillet, near Paris, on the Sth 

 and 9th of June last. 



The wool sold for 4 francs xVo? ^^^^ kilogramme in the 

 dirt. Lamb's wool, for 3frs. y^/^j the kilogramme, (21b, 

 3o2. 5dr. English ) 

 ^' Seventy rams, and sixty-four other sheep were sold, 



covered with wool. The highest priced ram brought 31 17^ 

 francs, and the lowest price 376|frs. 



The maximum price for the other sheep, 258 francs, and 

 minimum price, 134yVo fiancs. Jlu. de Chinuc. 



33, Enamel for porcelain. — The societyat the Adelphi for 

 the encouragement of the arts, have acknowledged the supe- 

 riority of an enamel, or glazing, for fine porcelain, composed 

 by John Rose It consists of a mixture of 27 parts of feld- 



j spar, 18 of borax, 4 of sand, 1 of common salt, 1 of nitre, 



and I of argil. After it is melted into a frit, three parts of 

 borax are to be added, and it is then reduced to powder. 

 This enamel attaches itself easily, and uniformly, without 

 melting or even softening of the porcelain. It diffuses it- 

 self uniformly, without lumps or unevenness, and it does 

 not conceal, or change the most delicate colours, such as 

 greens and chromic red. 



