. History of the city of Altoona and Blair county : including sketches of the shops of the Pennsylvania railroad co. . SLEEPING CAR.,. U. S. POSTAL CAR. HISTORY or ALTOONA AND BLAIR COUNTY. 171 obtained from Messrs. William Sellers & Co., aud Messrs. WilliamB. Bement & Son, of Philadelphia, in wholu, whoever may havebeen the inventors or patentees, was vested the right to manufactureand sell; and, in the Pennsylvania Railroad company, as we under-stand it, is now vested the same right, title and interest. Taking oft and putting on Mheels on a.\les, by hj-drostatic pres-sure, is an interesting
. History of the city of Altoona and Blair county : including sketches of the shops of the Pennsylvania railroad co. . SLEEPING CAR.,. U. S. POSTAL CAR. HISTORY or ALTOONA AND BLAIR COUNTY. 171 obtained from Messrs. William Sellers & Co., aud Messrs. WilliamB. Bement & Son, of Philadelphia, in wholu, whoever may havebeen the inventors or patentees, was vested the right to manufactureand sell; and, in the Pennsylvania Railroad company, as we under-stand it, is now vested the same right, title and interest. Taking oft and putting on Mheels on a.\les, by hj-drostatic pres-sure, is an interesting operation. Trom thirty to eighty tons pres-sure is brought to bear in removing wheels from their axles, andfrom twenty to forty tons in putting them on. Removing the burnt,warped and twisted wheels from burnt, warped and twisted axleswhich were in the lire at Pittsburg a few years ago, was a big were shown Avheels aud axles which were absolutelj^ fused ormelted together at the place they were conjc^ued—but the powerfulpressure applied released the one from the other. Freight car wheels and axles are made of iron
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