Atialyfti of StieL 24.9 



fnakes about 0,05 of the weight of the fteel employed. The fluid liksvvife depofited by 

 ebullition 96 grains of a deep red matter, which did not perceptibly con,tain phofphate,c^ 

 iron. 



From this refult it appears that the prefent fteel contains nearly three times the quantity 

 of phofphorus exhibited by No. 864, the fmall piece. For 576 afforded only 19 of phof- 

 phate of iron, whereas 1152, or only twice the quantity, afforded 58 grains. This fteel 

 inuft confequently be more brittle when cold, if, as there is no reafon to doubt from the 

 numerous experiments of Bergman and other chemifts, that phofphorus Is the effentlal caufe 

 of the cold fliort quality of iron and fteel. 



Experiment V. 288 grains of fteel No. 864, the large piece, diffolved in fulphureous acid, 

 as before mentioned, left 6,5 of carburet of iron, which, fuppofmg it to contain as much 

 fulphur and iron as that of No. 864, the fmall piece, would give 3,71 of carbone, or about 

 the o,oioth part, or rather more than one-hundredth part of the fteel employed. 



Experiment VI. This fteel was fubjefted to all the proofs calculated to ihewthe prefencc 

 of manganefe, but without any exhibition of that fubftance. It may therefore be concluded 

 that this fteel, as well as the other examined before, does not contain any perceptible 

 quantity of manganefe, at leaft fo far as the prefent methods of chemiftry are capable of 

 fhewing it *. ^ 



SECTION IV. 



. STEEL NO. 977. 



. Experiment I. 144 grains, or 7,631 grammes, of this fteel, diffolved in the fulphuric acid, 

 diluted with five parts of water, afforded 164,94 cubic inches of hydrogene gas, and left 

 0,941 grains, or about ©,05 grammes, of carburet of Iron, or nearly 0,007 °f ''^ mafs. 



Experiment II, 504 grains, or about 26,7 grammes, of the fame fteel, diffolved in the 

 fulpharic acid, diluted with five parts of water, the folutlon being diluted with a large 

 quantity of water, and its excefs of acid faturated with carbonate of pot-afti, depofited, a 

 few inftants afterwards, a large quantity of a white matter, (lightly inclining to grey, which 

 acquired a ftraw-colour by conta6l of the air. This matter was phofphate of iron, and 

 weighed 22 grains, or about i,i6 grammes. 



Experiment III. The liquid whence the phofphate of Iron had been precipitated by the 

 carbonate of pot-afti was fubmitted to ebullition, and again depofited 22 grains, or 1,16 

 grammes, of matter, in which, however, there was fcarcely any phofphate of iron. So that 

 504 grains of the fteel No. 977 contained 23 or 24 grains of phofphate of iron ; that is to 

 fay, 0,047 of its mafs. 



Experiment IV". Thefe 24 grains of phofphate of iron, treated by long ebullition with cauftic 

 foda, affumed a deep red colour, and after waftiing, and drying in the air, weighed only 

 15,33 grains. They loft therefore 8,67 grains of phofphorlc acid, which afforded 17,54 

 grains of cryftallized phofphate of foda. 



* The oxide of iron formed with this fteil, ftrongly oxidcd by the a£tlon of fire, and afterwards treated with 

 the nitric acid and fugar, afforded an oxide which tlircw down a very beautiful blue witli the prwdiatc of pot-afli, 

 The fame oxide fufcd with borax aH'ordcd a grecnilh globyle ; but wlien licjted witli the external flame at the 

 extremity of a pair of forceps it acquired a flight purple colour, which difapreartd as the globule became cold. 



Vol. I.— Septembur 1797. Kk Experiment 



