. The Popular science monthly . Photo, G. 11. Toothaker, Phila. Commercial of Lake. 22 THE POPULAR SCIENCE MONTHLY. Photo, C. R. Toothaker, Phila. Commercial Asphalt Rising through Water. The surface of the deposit or lake is not a uniform expanse of is grassy along the edges and becomes free from vegetation at somedistance from the center. Shrubs and small trees occur in a fewcases known as islands. These patches move from place to place withthe movement of the pitch at the surface. The main mass of asphalt is abroad expanse of pitch made up of separate area
. The Popular science monthly . Photo, G. 11. Toothaker, Phila. Commercial of Lake. 22 THE POPULAR SCIENCE MONTHLY. Photo, C. R. Toothaker, Phila. Commercial Asphalt Rising through Water. The surface of the deposit or lake is not a uniform expanse of is grassy along the edges and becomes free from vegetation at somedistance from the center. Shrubs and small trees occur in a fewcases known as islands. These patches move from place to place withthe movement of the pitch at the surface. The main mass of asphalt is abroad expanse of pitch made up of separate areas of irregular outline, butat times quite circular, which are separated by channels, filled with rainwater, which prevents their coalescence. The boundaries are depressedand the center of the areas is always somewhat elevated above theedges, that is to say, they are mushroom-like. The origin of the separateareas evidently lies in the constant movement of the crude material, due
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Keywords: ., bookcentury1900, booksubjectscience, booksubjecttechnology, booky
