t person by passing the vapor of salicylamin over red-hot who prepared and introduced aniline colors, and to quicklime ; and from this time forward the study of The annexed engraving is a representation of an him belongs the chief credit of their application to the secondary products of aniline was… … and Germany with arsenious acid. atus is at once simple and efficient. The use of this substance was in- This invention was patented No- troduced and patented by R. Heil- vember 11, 1862, by Nathaniel Rich- ardson, Byberry, XXIII. Ward, in the city of Phila- A definite method of preparing aniline…
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