^Tfy A ncio Method of 'Impregnating Water 



This indication is read on the anterior part of the beam. 



where the words atmafpheric air arc marked. 



Not fatisfied with having procured to philofopherg, and 

 thofe fond of accurate experiments, an inurnment extremely 

 convenient for the clofct, and of very extenfive u'.'e, C. Paul 

 has endeavoured to render this apparatus portable, and h;u 

 conftructed various pocket fieel-yards, with which theniceft 

 experiments may be made, and the quality of gold coin be 

 afcertained bv the trial of its fpecific gravity. They are 

 conftrucled exactly on the fame principles as the Roman 

 fmall fteel-yard, but are necefi'arily lefs extenfive in their ufc 

 They cannot be employed, for example, in determining the 

 fpecific gravity of an a.riform fluid, and do not extend beyond 

 joodeniers of yeight, (about I ao grammes 5) but as they 

 poflefs all the advantages of a balance, befides thofe peculiar 

 to tbemfehres, they are extremely convenient for philoibphers 

 who are obliged to travel. 



EXPLANATION OF THE PLATE. 



A, R, the beam of C. Paul's fteel-yard with its divifions, 

 commencing at the point of fufpenfion. F, divifion of the 

 other fide of the fame beam, commencing at the other ex- 

 tremity, or that fartheft diftant from the point of fufpenfion. 

 G, a fmall frame deftined to prevent the ofcillation of the 

 beam. C, a hook from which the weights are fufpended. 

 E, a brafs (hell or bafon. IT, a ball of folid glafs for trying 

 the fpecific gravity of liquids. N, a glafs balloon for trying 

 the fpecific gravity ofgafes. 



XIIT. A new, eafy, and cheap Method of impregnating IVuter 

 with Carbonic Add Gas. Communicated by Dr. A. N. 

 Sc n E R E R, Counsellor of Mines to the Duke o/Saxe Weimar, 



D 



R. FIERLIXGER has propofed the following yer? 

 fimple method for impregnating water with carbon ip acid 

 6 gas. 



