. American engineer and railroad journal . lling tothai for reaming may instantly be obtained by pulling a the feeds are positive, a safety clutch is provided, so thatthe feed will slip, if due to carelessness on the part of theoperator, the nose of the spindle should strike the work. Thheads are adjustable on the cross rail by the hand wheel whichoperates through the worm and spur gearing. An automaticknock-off permits the feed to be thrown out at any point. Thespindle is provided with a quick return motion and also with ahand feed through worm gearing. The spindles are of forgedopen
. American engineer and railroad journal . lling tothai for reaming may instantly be obtained by pulling a the feeds are positive, a safety clutch is provided, so thatthe feed will slip, if due to carelessness on the part of theoperator, the nose of the spindle should strike the work. Thheads are adjustable on the cross rail by the hand wheel whichoperates through the worm and spur gearing. An automaticknock-off permits the feed to be thrown out at any point. Thespindle is provided with a quick return motion and also with ahand feed through worm gearing. The spindles are of forgedopen hearth steel, with ball bearing thrust collars, and have12 ins. of vertical power feed. The heads are carefullj de-tor rigidity when the spindles are in the extreme outerposition and working under the most severe conditions. Eachone of the heads weighs 965 lbs., and this will serve to sivesome idea as to their strength and size. This machine wasmade by Foote, Burt & Cornpany, Cleveland, Ohio, and weighscomplete about 12 Mail Service.—The United States Post Office Departmenthandled last year 9,502,459,535 pieces of mail matter. DETAILS OF HEADS OE MULTIPLE I1HIIX. lily at 70 deg. is assumed to have a humidity of 70 per cent,and to be saturated when it leaves the body at a higher tem-perature, then at least 4 cu. ft. of air per minute will be re-quired to carry away this vapor. August, 1905. AMERICAN* ENGINEER AND RAILROAD JOUBNAL 305 Taking into consideration these various factors, it becomesevident that at least 4% cu. ft. of fresh air will be requiredper minute for respiration, and for the absorption of moistureand dilution of carbonic acid gas from the skin. This, how-ever, is only on the assumption that any given quantity of air,having fulfilled its office, is immediately removed withoutcontamination of the surrounding atmosphere; but this con-dition is impossible, for the spent air from the lungs, contain-ing about 100 parts of carbonic acid gas in 10,000, is imme
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
