370 Water-proof Cloth i--Galvafiifih, 



of Scotland- 5 with violent agitations of Loch Nefs, Loch- 

 Tav, Sec. 



The foreign journals alfo notice an earthquake having taken 

 place at Colmar on the morning of the nth of September, 

 which had fpread a confiderable degree of alarm. That 

 morning, at a quarter pall one, a great number of people 

 were awakened by a hollow noife and certain agitation, which 

 was felt in the houfes, and fhook the furniture. Several 

 {hocks followed the firft : at a quarter paft two^ there was one 

 pretty {trong. 



WATER-PROOF CLOTtf. 



To difcovcr a procefs for rendering cloth water-proof, 

 without at the fame time filling its pores in fuch a manner 

 as to prevent perlpi ration, has long been a defideratum. It 

 gives us pleafure to announce a difcovery which promifes fo 

 many advantages, in point of health and comfort, to all ranks 

 in the community. By favour of the patentees, Meflrs. 

 Ackermann, Suardy, and Co. we are enabled to prefent our 

 readers with a fpecimen of the art, namely, a piece of blotting 

 paper; one-half of which has been fubjecled to the water-proof 

 procefs. By fprinkling a little water over it, the prepared 

 part will eafily be diftinguifhed. 



GALVANISM. 



At a late meeting of the committee for apparatus of the 

 Afkefian Societv, fome experiments were made with a Gal- 

 vanic trough, of the cnnftru&ion invented by Cruickfhank. 

 Tlie one belonging to the ibciety confifts of fixty pieces of fil- 

 ver, and the fanie number of pieces of zinc, each i\ inches 

 fquarc. They arc (oldercd together at the four edges, and are 

 very exactly in contact. The trough is of mahogany, with 

 grooves 'half a n inch apart from each other. The pieces are 

 iecured in theie groves by a cement, compofed of hard var- 

 nifh and bee's wax. The cells between each pair were filled 

 with a weak i'olution of muriat of ammonia a quarter of an 

 ounce to two quarts of water, which is nearly the quantity 

 the apparatus 'takes* The fhock taken from this trough bv 

 two metallic conductors is felt plainly in the moulders. The 

 fpafrn or contraction at tin: time is fo fevere as to deprive the 

 pefron of the power offtoTtiihg the conductors in contact with 

 the end plates. When kept in contact by an affiftant, a fen- 

 iation refemblinga highly heated fluid is felt rufhing through 

 the wrilts and ton --arm. 



A piece of fmall iteel wire being made a conductor to unite' 



tBfc cud pieces, 6a making the contact, a bright fpark was 



i) obfefved^ 



