Foreign Literature and Science. 



189 



31. Signals for a great distance.— Schwmncher, a captain 

 of artillery, has invented a Rocket which may become of 

 ^reat use to astronomers, and geographers. They have a 

 much greater force than the Congreve rockets, and ascend 

 10 a prodigious heighth. When at their greatest elevation 

 ihey 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 little 

 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. Idetn. 



32. 3Ierino sheep, ami ivool—A number of Merino 

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

 Royal establishment of Rambouillet, near Pans, on the 8th 

 and 9th of June last. 



The wool sold for 4 francs ^Vo. the kilogramme in the 

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



3oz. 5dr. English ) . , , ij 



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



covered with wool. The highest priced ram brought 31171 



francs, and the lowest price 376ifrs. 



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



minimum price, 134AV francs. ^u. de Chnuc. 



33 Enamel for porcelain.— The society at 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- 

 spar 18 of borax, 4 of sand, 1 of common saU, 1 of nitre, 

 and 1 of argil. After it is melted into a frit, three parts ot 

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

 This enamel attaches itself easily, and uniformly, without 

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

 self uniformly, without lumps or unevenness, and it does 

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

 greens and chromic red. 



