. Railway mechanical engineer . 55 and , respectively, and withcounter shaft speeds of 243 and 128 revolutions per minute,a total of IS spindle speeds is available, varying from p. m. to 300 r. p. m. With a counter shaft speed of243 revolutions per minute and the belt on the middle stepof the cone, 16 hp. is transmitted to the lathe. The carriage is guided by the front V, which is of thebroad, low-angle type. A range of from 1 to 14 threads perinch may be obtained without additional feed gears. Be-tween 1 and 1T 2 threads per inch, the steps are by eighthsof a thread per inch. From \
. Railway mechanical engineer . 55 and , respectively, and withcounter shaft speeds of 243 and 128 revolutions per minute,a total of IS spindle speeds is available, varying from p. m. to 300 r. p. m. With a counter shaft speed of243 revolutions per minute and the belt on the middle stepof the cone, 16 hp. is transmitted to the lathe. The carriage is guided by the front V, which is of thebroad, low-angle type. A range of from 1 to 14 threads perinch may be obtained without additional feed gears. Be-tween 1 and 1T 2 threads per inch, the steps are by eighthsof a thread per inch. From \l/2 to 3 threads per inch, thesteps are by quarters, from 3 to 6 by halves, while from 6to 14, the steps are one thread per inch. Twenty-four feedsare provided without gear changes. By the use of additionalgear changes any United States standard thread or metricthread, and any feed, may be obtained. When specified, ahousing is furnished covering the entire top of the head-stock, to receive a motor for motor drive. Any length of. Heavy Duty Double Back Gear Engine Lathe clamping of the flue. The main mandrel is driven throughtwo gear reductions by a \]A-\\^>. motor. This motor ismounted on the framework underneath the gearing and takesup very little space. Cut gears are used throughout. It is estimated by the builders that one crew can easilyweld in a day of 10 hours, 120 superheater flues, the ma-chine having a capacity up to 5^-in. flues. The air pres-sure required is 80 to 100 lb. and the floor space occupied3 ft. 6 in. by 9 ft. bed desired can be furnished up to 30 ft. When mounted onskids and equipped with motor drive (excluding the weightof the motor) the lathe with the minimum length bedweighs approximately 18,000 lb. Pig Iron Production-.—The total pig iron production inthe United States for the first half of 1916 was 19,610,522tons. The production of pig iron in Canada during the sameperiod was tons. RailwayMechanical Engineer (Formerly the RAILWAY AGE GAZE
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