ADVERTISEMENT. 



A.N. Edelcrantz. 1 2. A Galvanic Apparatus by Mr. Davy # 

 13. An Electrical Battery of Talc. 14. A Compound Arti- 

 ficial Magnet of four Poles. 15. The Swedish Telegraph, 

 invented by Sir A. N. Edelcrantz. 16. An Apparatus for 

 determining the comparative Wear of Gold, by the Hon. H. 

 Cavendish, Esq. 17. Mr. Henry's Apparatus for measuring 

 the Absorption of Gafes. 18. A Subterraneous Graphome- 

 ter, by M. Komarzewski. 



Soho Square, August, 1803. 



