ng of $18, an annual saving of over ‘Upon a base carried on wheels, so as to be capable The two arms of each derrick are of different $5,000. Owing to the more uniform cutting of the of movement when it is desired, is mounted a vertical lengths, one being long enough to handle skips clear machine,… … to the American Journal of the Upper Andes, and be- Science, says: In July, 1894, tween the two sides of a a new locality of true emeralds was discovered by canon, which is situated 10,000 ft. above the level of ranged to move up and down this column, and this Mr. J. L. Rorison, miner of mica, and…
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