A 



JOURNAL, 



OF 



NATURAL PHILOSOPHY, CHEMISTRY, 



ANO 



THE ARTS. 



SUPPLEMENT TO VOL. XV1L 



ARTICLE I. 



description of a Machine for triturating and combining Quick* 

 silver with other Substances, by a Correspondent. 

 SIR, 



JL HE difficulty and tediousness of the process of combin- Combination of 



ing pure mercury with mucilaginous or fat substances by " lercur >" W1 'f 1 



. . . , , . ^ fats or mucila- 



tnturation with a pestle and mortar, so as to bring it to ge s tedious. 



that state of extreme division, in which alone it can exert 



all its efficacy as a medicine, are well known ; on account Means of acce* 



of which some have recommended the use of a small quan- i^qus m " 



tity of flowers of sulphur, or of sulphuretted oil, others 



that of rancid fat, each of which operates by its chemical 



action on the mercury, and so far is at variance with th.3 



original intention. In forming mercurial plasters the use Hence tnercu-s, 



of some such substance as sulphuretted oil, or turpentine, "*J [* f^ 



has been found particularly necessary \ and owing to this tive. 



perhaps less benefit has been derived from them, than the 



practitioner has expected. I trust therefore an account of Machine for 



a machine, contrived to produce the effect very speedily l e P ur l ;ose « 



and with little labour, may not be unacceptable to many of 



your readers. 



The apparatus consists of a piece of cast iron, A, Plate Description of 

 IX. Fig. 1. about two feet long and four inches wide, cur- the a PP aratu * 

 yed so as to form a segment of a circle of four feet radius. 



Vol. XVII.— Supplement. Y Per. 



