. Railway mechanical engineer . n the end in the process of swaging is loosened in the proc-ess of expanding and as there is no avenue of escape, itremains between the tube and the copper ferrule and mustbe a great contributing factor to the leakage of tubes. Fil-ing or otherwise cleaning the ends of tubes before applyingwill relieve this. In order to have a tight joint, we musthave a clean, smooth joint. The Prosser expander is a most useful tool, but care andgood judgment should be exercised in its use. A tube canbe expanded to such an extent as to reduce its elasticity,then there is no resp
. Railway mechanical engineer . n the end in the process of swaging is loosened in the proc-ess of expanding and as there is no avenue of escape, itremains between the tube and the copper ferrule and mustbe a great contributing factor to the leakage of tubes. Fil-ing or otherwise cleaning the ends of tubes before applyingwill relieve this. In order to have a tight joint, we musthave a clean, smooth joint. The Prosser expander is a most useful tool, but care andgood judgment should be exercised in its use. A tube canbe expanded to such an extent as to reduce its elasticity,then there is no response to efforts to keep it tight. To sub-stantiate the claim that this tool is abused I will cite aninstance where a new tube sheet had been applied. It wascarefully trammed just below the bottom tube at the centerrow and as near to the top flange as we could get. Afterthe tubes were applied this distance was checked up, andwas found to be greater by 3-16 in., showing that tubes andtube sheet had suffered by careless New Devices V^jyy^^,ltf/VAiVUlAfrW^AtA--P^^^
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
