Observations on bituminous substances, with a description of the varieties of the elastic bitumen ... Read in the Linnaean Soc / by Charles Hatchett.

  • Charles Hatchett
Date:
[1798]
Catalogue details

Licence: Public Domain Mark

Credit: Observations on bituminous substances, with a description of the varieties of the elastic bitumen ... Read in the Linnaean Soc / by Charles Hatchett. Source: Wellcome Collection.

    22/28 (page 148)
    . A, No. 3. Dark brown bitumen of a ftala6titical form, hard, but in fome decree elaftic. ■ 'r * • > r. iStlti::, : A, No. 4. Bitumen of a reddifh brown, in the form of globules, fome of which are elaftic, and others hard : on brownifh-grey limeftone,, accompanied by cryffallized white fluor, dogtooth calcareous fpar,. and pyrites in fmall cryftals, fome of which are on the furfac© of the ,globules of bitumen. ; I A> 5- , The fame of a darker brown, of a ftalatftitical form, hard and brittle; on pale brown calcareous fpar, impregnated with bitu¬ men. r 1 , 1 /i < 4 / . , _ j l f ■■ ■* ■* v ’ c j i j L) f * * 1 * l * {\ i i ■ j v x O A, No. 6, Bitumen of a dark reddifh brown, very hard ; on pale brown fparry ftink-ftone, with grey limeftone, in which are fome coralloides. , : ,r . * 0 11 i;■ ,? ]■ • t —v .. A, No. 7. Bitumen of a dark yellowifh brown, elaftic, but very foft, fo that it adheres to the fingers. . j n'jiaji • ) zi * jr, A, No. 8. The fame thinly fpread over grey fparry ftink-ftone. ? . . r f / f A XT A, No. 9. Bitumen of a brownifh olive colour, which becomes reddifh brown by the air, but when oppofed to the light it appears femi- tranfparent,