. Railway master mechanic [microform] . d progress beingmade in economic railroad operation. The tendency ofpassenger and freight rates is steadily downward, andthat the railroads may live on the reduced rates, thecost of operation must decrease likewise. The motivepower department must contribute its share to the re-duction of expenses, and must do it by giving carefulattention to its business problems. •-•-♦ THE CROSBY THERilOSTATIC GAGE. In our last issue we had an article on locomotivesteam gages, wherein inaccuracies of gages causedby heat were dwelt upon. The Crosby Steam Gageand Valve C
. Railway master mechanic [microform] . d progress beingmade in economic railroad operation. The tendency ofpassenger and freight rates is steadily downward, andthat the railroads may live on the reduced rates, thecost of operation must decrease likewise. The motivepower department must contribute its share to the re-duction of expenses, and must do it by giving carefulattention to its business problems. •-•-♦ THE CROSBY THERilOSTATIC GAGE. In our last issue we had an article on locomotivesteam gages, wherein inaccuracies of gages causedby heat were dwelt upon. The Crosby Steam Gageand Valve Company of Boston, noting the article,sends us a description of its thermostatic water-back gage, which was designed especially to meetthe troubles to which allusion was made. Thetrouble is, as was set forth in the article, that thesteam gage, when in use, is on account of its loca-tion so heated that its parts expand to such an ex-tent that it will make wrong records of such case the parts which materially affect the. THE CROSBY THERMOSTATIC GAUGE. correct operation of the gage are tube springs. Itoccurs thus: The tube springs having Deen testedand adjusted to a certain movement under pressurein the ordinary temperature of the factory or whereit takes place, will when the same are heated in useto a high temperature, lengthen by expansion tosuch an extent that, when they are subjected to thesame pressure, their free ends will move through alarger arc than when they were tested. This move-ment, multiplied by the ordinary mechanism of asteam gage for transmitting it, causes this in-creased pressure to appear upoD the dial. In sucha heated condition of the tube springs, the errorproduced is sometimes considerable, being severalper cent greater than the true pressure, thus deceiv-ing the user of steam into the belief that he is get-ting a less result, in work, from the indicated press-ure than he ought. This error can be corrected by suitable mechan-ism in the ste
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1895
