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Page:Popular Science Monthly Volume 81.djvu/32

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PSM V81 D032 Transportation of pitch from the refinery to pier.png

Photo, C. R. Toothaker, Phila. Commercial Museum.

Transportation of Pitch by Aerial Cable from Refinery to Pier.

The average composition of samples taken on circles 200, 400, 600, 800, 1,000 and 1,100 feet from the center of the deposits, and for the average material from the entire depth of the boring, as determined by routine methods, was found, after drying the material to free it from the water which is present, to be as follows:


Average Composition of Trinidad Lake Pitch in Circles

Bit. by CS2, Per Cent. Mineral Matter, Per Cent. Organic not Soluble, Per Cent. Soluble in Naphtha, Per Cent. Total Bitumen thus Soluble, Per Cent.
Circle 2, 200 ft. from center 55.02 35.41 9.57 31.83 57.85
Circle 4, 400 ft. from center 54.99 35.40 9.61 31.63 57.55
Circle 6, 600 ft. from center 54.84 35.59 9.67 31.85 58.26
Circle 8, 800 ft. from center 54.66 35.56 9.78 31.67 57.97
Circle 10, 1,000 ft. from center 54.78 35.44 9.78 31.58 57.64
Circle 12, 1,100 ft. from center 54.62 35.45 9.93 31.77 57.51
General average 54.92 35.46 9.72 31.72 57.79
Circle 14, 14,000 ft. from center 53.86 36.38 9.76 30.52 56.66

The great uniformity of the deposit is revealed by these figures.

The water is probably of thermal origin, as it contains borates and iodides. Chlorides and sulphates of sodium are the predominating salts, sulphate of ammonia in marked amount, while chloride of potassium, lime and magnesium and ferrous iron are present. It is impossible to separate the water from the bitumen without change, but in the old methods of refining pools of it would collect on the surface of the asphalt, and this water, although somewhat concentrated and oxidized, had the following composition: