![](http://www.alamy.com/thumbs/6/31C2F3C1-66E8-450A-9106-E0A5258CE36C/HBPX38.jpg)
Image taken from page 50 of 'Twenty Years' Practical Experience of Natural Asphalt and Mineral Bitumen. [With illustrations.]' Image taken from page 50 of 'Twenty Years' Practical Experience
Size: 2889px × 865px
Photo credit: © Classic Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: &, ancient, antique, blackletter, bldigital, book, books, borders, bygone, calligraphic, calligraphy, cover, date:1893, delano, diagram, draw, drawing, font, henry., historic, history, illustration, image, imagesfrombook:000897836, imagesfromvolume:000897836_0, letter, lettering, manuscript, map, mechanical_curator, ornate, page, page:50, pages, public_domain, pubplace:london, scan, sherlocknet:category=diagrams, sherlocknet:tag=angle, sherlocknet:tag=case, sherlocknet:tag=differ, sherlocknet:tag=ellipsoid, sherlocknet:tag=fall, sherlocknet:tag=filch, sherlocknet:tag=fir, sherlocknet:tag=form, sherlocknet:tag=general, sherlocknet:tag=lager, sherlocknet:tag=lamp, sherlocknet:tag=line, sherlocknet:tag=linen, sherlocknet:tag=nature, sherlocknet:tag=point, sherlocknet:tag=side, sherlocknet:tag=soil, sherlocknet:tag=upper, sketch, small, sysnum:000897836, vintage, vol:0, william