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March, 1912 operator. This mechanism is con- nected to the operating arms and segments in the buckets by means of heavy flat link chains. The machinery for rotating the bucket leg is mounted next 'to the bucket mechanism in the walking beam and consists of a 35-h. p. motor geared: to a drum upon which the rotating ropes are wound. The ropes from this drum are carried through the walking beam and 'connected to nu rotating segment at the top of the bucket. leg. The speeds of this machine are so regulated that. a round trip is possi- ble in approximately 50 seconds and the capacity of the four machines working under favorable conditions would be between 35,000 and 40,000 tons per day, double shift. The 15-ton rehandling -- stocking bridge which travels along the storage yard at the rear of the unloaders, has a span of 266 ft. with cantilevers overhanging the span, of 173 ft. at each end, making a _ total overal) trolley travel of approximately 581 ft. -The Ore Conveying Bridge The front runway of the bridge is located 168 ft. back of the _ rear runway of the unloader, and _ the length of cantilever is such that the bucket is able to reaeh ore in the pit at the rear-of the unloaders. The bridge is carried on a tower at the forward end of the span and =the shear leg at the rear of the span. These supports are flexibly connect- ed to the bridge so that it is possi- ble for the bridge to adjust itself to unevenness in the track, without producing undue strains in the struc- ture, and it is also capable of swiv- cling through a slight angle on either side of the central position. The lower side of the bridge sup- ports a runway "for the bucket handling trolley. This runway extends the entire length of the bridge struc- ture, including span and cantilevers. The trolley which carries the ex- cavating bucket is of the self-con- tained type, having an operator's cab suspended from the trolley frame- work and in this cab are located the controllers for operating the dif- terent motions of the bucket, such as opening, closing and hoisting, as well as cross-traversing the trolley. All of the ore from the pit at the rear of the unloaders is handled by this bucket and carried back into the storage piles under the cantilevers and span for storage purposes. When _ the ore is required from this storage it is rehandled by means of the bucket and discharged into a receiving '4s not mm. motion. THE MARINE REVIEW hopper built into the framework of the main tower. This hopper has a capacity of 75 tons of ore Sea is provided with discharge gates at the bottom for dumping the. ore into .a scale hopper located beneath these gates. This scale hopper is suspend- ed from the tower directly over a ioading track, upon which railroad cars will stand when receiving ore. The bottom of the weighing hopper is provided with gates which are ex- actly similar to those used on the scale larry. of the unloader. The scales are provided with beams so that accurate weights may be recorded and the gates are of the cut-off type, which enable the weigh master to discharge any _ predeter- mined amount of ore into the cars standing on the track beneath. The tower and shear leg of the bridge are mounted on trucks which travel along the runway rails. Electrically Operated The driving trucks are connected by gearing and shafting to the bridge travel motors. Separate motors are provided for driving the tower and shear leg. These motors being 75 h. p. are mounted on the sills and the controllers located in the bridge operator's house, suspended from the bridge at main tower. This operator's house is so located that the trolley operator can move the trolley oppo- site the house and step from the cab to the house. The motors are pro- vided with electric brakes for locking the driving trucks when the bridge _ These brakes are automatically operated and set as soon as the car is cut off of the travel motors. This bridge is electrically operated throughout, the current being ob- tained from feed rails which are lo- cated along the bridge runway and taken off by means of sliding con- tact shoes, which are carried on the bridge. The bucket which is suspended from the trolley has a capacity of 15 tons of ore. This bucket is operated by means of ropes wound on drums in the trolley. The opening and closing ropes are wound on separate drums operated by separate motors. motors are provided with dynamic braking attachment, sc that the op- erator has full control of the lower- ing of the bucket either loaded or empty, without the use of mechanical brakes. The trolley is traversed by means of two 75 h. p. motors which are geared to the trolley axles. These motors are also operated by magnetic control boards, the master controllers recording | These | 101 being located in the operator's cab. The trolley is provided with a dy- namic braking attachment for 'con- trolling the motions of the trolley and also with emergency air cylinders which operate mechanical brakes. Each end of the trolley runway is provided with heavy spring bumpers, which prevent the trolley from running off the end of the bridge. The speeds of this machine are as follows: Hoisting, 175 ft. per minute: cross travel speed of the trolley, 600 to 800 ft. per minute; travel of the bridge along runway, 50 to 75 ft. per minute. Under favorable conditions when operating at these speeds, the bridge will be capable of handling approxi- mately J,000 tons per hour, The dynamic braking attachment ap- plied both to the hoist and trolley motions, is also applied to the vari- ous motions of the unloader and is especially desirable in connection with the' safe and accurate handling of heavy toads. It is accomplished by causing the motors to act as generat- ors, thus producing retarding effect which is proportionate to the resist- ance in the line and by varying this resistance it is possible to secure ac- curate control of the moving load. without depending upon mechanical devices in any way.' C. O. Bartlett & Snow. Co. The C. O. Bartlett & Snow Co., of Cleveland, has just increased its cap- ital stock to $500,000. This business | was founded about 25 years ago by C. O. Bartlett, making oat meal, bar- ley pearling and general mill ma chinery in a small way. The bus- iness, however, expanded: with the years and with the natural develop- ment of the country until today the com- pany occupies a prominent position as engineers and manufacturers of all kinds of elevating and conveying machinery, coal tipples and _ coal- handling machinery. for mines and docks, scows for fueling lake vessels and ash-handling machinery, as well as mechanical dryers and crushed stone, gravel and sand-handling and washing plants. The company has also built up in recent years a large export trade with Mexico, Canada and South America. The increased capital is in- tended to extend the company's plant. The officers of the company are C. O. Bartlett, president; E. J. Neville, first vice president and general man- ager; TH. H. Bighouse, second vice president; H. L. McKinnon, third vice president, and I. M. Snow, sec- retary.