2H. Ntw Frocejfcs fif Anahju'g Stiet. 



Expmtnent 11. loo grains, or 5,3 grammes, of the fame (led didblved in the requifite 

 quantity of fulphurie acid, produced io3 inches, or 2169 millimetres cube of hydrogene 



gas- 



Nctu Procrfs tofepanite the Phafphate of Iron from Sttcl. 



Experiment III. The excefs of acid contained in the folution No. 1. having been fa- 

 turatcd with (jarbonate of pot-afli, there were depofited 19 grains, or about one gramme, 

 of a white taftelefs powder, completely foluble in muriatic acid. 



This matter, boiled in a folution of caudic fotla, alTumed a deep red colour, and greatly 

 dimini(hcd in volume. 



The liquor having been filtered, and mixed with concentrated muriatic acid, gave no 

 fign of eflervefcence, and formed, before and after its mixture with the muriatic acid, a 

 white precipitate, on the addition of lime-water. 



-This calcareous depofition, being wafhed and dried, was foluble in" acids, and without 

 producing any eflervefcence ; whence we may conclude that it is phofphate of lime, and 

 confequently that the fteel No. 864, the fmall piece, contains phofphorus. Experiments 

 flill more pofitive afford an inconteflable proof of the truth of wliat is here advanced on the 

 nature of this fubftance. 



The Inconvenience cf ufing the Si:Iphiiric /liiJ to tiderniiw the J^ftl.iti/y of Carkne contained 



in S/ecL 



CHEMICAL experiments having demonfkr.Ued that hydrogene, when it develops itfelf 

 from the interior part of bodies which contain carbonc in a very divided ftate, diffolvcs a 

 certain quantity, which depends on the more or lefs elevated temperature, and the more 

 or lefs rapid difengagement of the gas, I had reafon to prefume that the refults offered by 

 the experiment numbered i, could not give an accurate cxpreffion of the quantity of car- 

 bone contained in the fteel. I therefore fought another method, in which the iron diffolved 

 ■without the difengagement of hydrogene gas fliould afford the real or abfolute quantity of 

 carbone which renders it fteel. , 



New Method of accurately determining the ^lantity of Cttrbone contained in Steel. 



AS the fulphureous acid pofftffes the double advantage of diffolving iron without producing 

 gas, and does not aft upon the carbure of iron, it prefented this defirable requifite. 

 ■ Experiment IV. I put into a bottle 288 grains, or is.iS grammes, of fteel, in fine 

 filings, with about two pounds, or about 978,24 grammes, of diftilled water, and I paffed 

 into this bottle fulphureous acid gas, difengaged from the fulphuric acid by mercury *. 

 When the fulphureous acid had ceafcd to a<5l on the ftccl, I carefully decanted the liquor 

 with a fiphon. 1 wafhed the black precipitate fevcral times with diftilled water. After 

 dcficcation by the gentle heat of the ftove, it weighed fcven grains, or about 6,37 grammes. 



Wc fee that this quantity of carbure of iron is much more confulerable than that of the 

 firft experiment. For 576 gave only 1,98, whereas, in the prefent experiment, I obtained 

 7 from 288. But on examining this matter, I found that it contained fulphur in a ftate 

 of mixture. For by expofing it on a heated metallic plate, it took fire, like fulphur alone. 



• Wc (hall not in this dcfcribc the phenomena which appear during t'.iis operation. They have been ex- 

 pofed by Citizen BcrthoUct, and wc have developed and extended thcra to other inetaK in i. parilcular memoiron 

 iht meralhc fulphatcs. V. 



' To 



