condensation. The sample which came from Tule he ranks with the coals
of the best quality. He believes that the innumerable fountains and
deposits of petroleum, bitumen, and asphalt that are apparent on the
surface of the region around Lake Maracaibo are proof of the existence
below of immense deposits of coal. These deposits have not been
uncovered because the territory remains for the most part as wild as it
was at the conquest.

* * * * *




ONE THOUSAND HORSE-POWER CORLISS ENGINE.


[Illustration: FIG. 1.

DIA. OF CYLINDER = 40''
STROKE = 10 ft.
REVS = 41
SCALE OF DIAGRAMS 40 LBS = 1 INCH

FIG. 2.]

We illustrate one of the largest Corliss engines ever constructed. It is
of the single cylinder, horizontal, condensing type, with one cylinder
40 inches diameter, and 10 feet stroke, and makes forty-five revolutions
per minute, corresponding to a piston speed of 900 feet per minute. At
mid stroke the velocity of the piston is 1,402 feet per minute nearly,