252 



CompdHint Parts of Steel, 



T.iblc of the Quantities of Phofphorus contained in each of tlie Samples of Steel. 



Analyfis having (liewn me that phofphate of iron is compofed of 0,58 of oxide of iron, 



and 0,42 of phofphoric acid, and this lafl being formed, according to Lavoilier, of 0,39 

 phofphorus, and 0,61 oxygcne, it follows that the flcel 



No. 864, fmall piece, contained phofphorus — 0,00345 



No. 864, l.irge piece — 0,00827 



No. 977 ■ — 0,00791 



No. 1024 — 0,01580 



I cannot venture, however, to afRrm that there really exifts fo great a difference betweea 

 the quantities of phofphorus contained in each of thefe pieces of ftecl as is here given by 

 experiment. For fo little is required to change the refutts in this refpeft, particularly 

 when fmall quantities are fubjet^cd to trial, that two or three thoufandth parts may fooii 

 be obtained either way. Neverthelefs, I cannot fuppofe, that, with the fame procefles and. 

 equal care, the difference between the niajtimum and minimum of thefe quantities will 

 prove to be the confequence of uncertainty in the methods of analyfis. 



A Synoptic Table of the Proportions of Principles contained in the four Kinds of Steel 

 before examined. 



Steel, No. 864, fmall piece 



1. C.irbone 



2. Silex 



3. Phofphorus 



4. Iron 



0,00789 

 0,00315 

 0,00345 

 0,98551 



No. 864, large piece 



1. Carbone 



2. Silex 



3. Phofphorus 



4. Iron 



1,00000 



0,00683 

 0,00273 

 0,00827 

 0,98217 



■ No. 977 



1. Carbone 



2. Silex 



3.- Phofphorus 

 4. Iron 



LjOOOOQ 



0,00789 

 0,00315 

 0,00791 

 0,98105 



■ No. 1024. 



:i. Carbone 



2. Silex 



3. Phofphorus 

 ,.4. Iron 



1,00000 



0,00631 

 0,00252 

 0,01520 

 0,97597 



1,00000 



SECTION 



