. The Cuba review. THE CUBA REVIEW^ Vi cavated. For this reason the scraper-bucket excavators are more satisfactory as well as more economical for excavation, although their capacity is considerably less than that of the large-size shovel used. Three of these excavators are now at work, together with one 90-ton Bucyrus steam-shovel. The excavators operate yards Page buckets, although a larger capacity of bucket is contemplated. The bucket swings through a radius of 60 feet, and without difficulty removes all the ore for a width of about 100 feet down to the rock bottom, the projecti
. The Cuba review. THE CUBA REVIEW^ Vi cavated. For this reason the scraper-bucket excavators are more satisfactory as well as more economical for excavation, although their capacity is considerably less than that of the large-size shovel used. Three of these excavators are now at work, together with one 90-ton Bucyrus steam-shovel. The excavators operate yards Page buckets, although a larger capacity of bucket is contemplated. The bucket swings through a radius of 60 feet, and without difficulty removes all the ore for a width of about 100 feet down to the rock bottom, the projecting rock and stumps being discarded. Each ma- chine-crew consists of one operator, one fireman, and three pitmen. As the machine works up hill or down hill continually, and the track follows the same grade, cars can be dropped down by gravity to be loaded as needed, with a minimum aomunt of loco- motive service. The nodulizing plant, located on the east side of the raw-ore yard, consists of twelve rotar\- kilns, 10 feet in diameter, and 125 feet long, set at an inclination of % inch per foot, and 20 feet apart. The kilns are of the type commonly used in the manufacture of cement. The diameter, however, is unusually large in order to overcome trouble from "ringing-up" in the hot zone, which often causes serious delays in the operation of kilns of smaller diameter. Each kiln is carried by two steel tires rigidly fastened to the shell. The cut-steel driving-gear attached to the shell close to the tire near the cold end is inches in diameter, and 4 inches in pitch. Each kiln is driven by a 35 horse-power variable-speed motor. A over-head electric traveling-crane, carrying a man- trolley with 3 cubic yards grab-bucket, is provided for removing the nodules from the trough of the nodulizing plant and loading them into oO-ton electric transfer-cars on the track passing alongside of the trough. The construction at the water-front is somewhat unusual. Close to the
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