FIRE CLAYS AND FIRE-BRICK INDUSTRY. 327 



taken. They are not always branded No. 1, for the best brick 

 made at any one works may be branded XX, Special Ai, or pos- 

 sibly something else. It will be seen from a comparison even of 

 those marked No. 1 that they vary in their refractoriness, from 

 cone 33 down to cone 2.7, and that there is as great a difference 

 between the highest grades of different manufacturers as there is 

 between some No. i's and some No. 4's. In other words, the low- 

 est grade brick of some manufacturers fuse at a higher tempera- 

 ture than the best grade of other makers. 



Chemical composition and fusion point of New Jersey fire brick. 









Ferric 



Titanium 





Cone of 



Absorp 





No. 



Silica. 



Alumina 



oxide. 



oxide. 



Total. 



fusion. 



Hon. 



Grade 



1 



78.24 



19.24 



0.68 



1.66 



99.82 



33 



13-39 





2 



82.45 



14.86 



1-54 



0.90 



99-75 



32 



12.92 





3 



68.70 



25.80 



3-35 



1-25 



99.10 



27 



11.25 





4 



77.15 



19.46 



1.99 



0.95 



99-55 



27 



14-33 





5 



75-20 



21.09 



1-37 



1.72 



99.38 



33 



12.72 





6 



81.10 



I5-8I 



2.19 



* 



99.10 



27 



13.92 





7 



68.90 



28.21 



0.78 



1.69 



99.38 



32 



13.39 





8 



54-68 



3935 



2.42 



2.53 





32 







9 



85-15 



12.22 



1.48 



1. 10 



99-95 



33 







10 



74.01 



19-13 



1.76 



4-30 





31-32 





2 



11 



77-50 



20.40 



1. 00 



* 



98.90 



33 





1 



12 



81.20 



14.98 



0.92 



1-43 



98.53 



30 



11.90 



2 



13 



72.37 



24.67 



0.98 



1.79 ' 



99-93 



32 



11.97 



2 



14 



82.30 



14.84 



1.70 



0.71 



99-55 



3i 



12.48 



2 



15 



74.10 



21.72 



1-37 



1.91 



99.10 



32 



11.70 



2 



16 



84.99 



13.20 



1-75 



* 



99-94 



30-31? 



13-39 



2 



17 



79.10 



18.30 



0.70 



* 



98.10 





12.52 



2 



18 



78.84 



18.06 



0.65 



1-53 



99.08 



3i 





2 



19 



74-54 



22.23 



1.63 



1-43 



99-83 



30 





1 



20 



75-05 



20.06 



1-74 



1.50 



98.35 



31-32 



14-45 



3 



21 



77-55 



17.82 



3.48 



1.20 



100.05 



27? 





3 



22 



77-32 



19-51 



1. 11 



1.86 



99.80 



28-29 



5-37 



3 



23 



77-80 



18.29 



1.50 



1.61 



99.20 



3i? 



12.96 



3 



24 



73-48 



22.35 



1.07 



1-73 



, 98.63 



30 





3 



25 



78.50 



19.20 



0.80 



* 



98.50 



30 





3 



26 



77-30 



18.99 



2.06 



1.05 



99.40 



31-32 



11.64 



4 



27 



74-70 



20.86 



0.98 



1.62 



98.16 



28 



11.42 



4 



Titanium oxide is included with the Alumina in these analyses. 



