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JOURNAL 



OP 



NATURAL PHILOSOPHY, CHEMISTRY, 



AND 



THE ARTS. 



SEPTEMBER, 1805. 



ARTICLE I. 



Letter from Davies Giddy, Efcj. M. P. defcribing a fingular 

 FdSt of the invifible Emijfwn of Steam and Smoke together from 

 the Chimney of a Furnace ; though either of them, if feparatelj/ 

 emitted, is vifible as ufuaL 



To Mr. NICHOLSON. 



SIR, CUfton, Augujle, 1805. 



A RAVELLING, and a variety of occupations, have hi- Peculiar fa&s 



therto prevented me from fending you an account of the cir- , ved in « 

 1 ° J working one of 



cumftances obferved by myfelf and others, during the work-Trevith'ck's 



ing of an engine on Mr. Trevithick/s conftru6tion, at Merthyn fteana ^"es. 



Tidwell in South Wales, and which I had the pleafure of 



relating to you, fome time fince, in Soho Square. I now 



tranfmit a it ulement of the fads, avoiding all comments or 



attempts at explanation. 



Mr. Trevithick having adapted his fleam engine to <he The ftaam en * 

 j r c ■ . • i ^ glnewas «H red 



purpole of moving waggons, contrived gvery accefiary part To'nldv* a df- 



as light as he poffibty could, and as little inconvenient to per- ri, s e * and evPr T 



fons who might affift, or witnets an exm riment. The Ane^" AmpSe!' 81 * 



for convening off the fmok'e, and atfoiuing a draft, was made 



Vol. XII.—SiifTEMBiiR, 1805, £ of 



