. Electric railway journal . e until all smoke ceases, showingthat all oil and dirt have been burned off. The surfacecan then be scraped with a file and rubbed down withcoarse sandpaper in order to remove all scale and , pipe or steel shells which are tinned shouldhave the old lining removed by heating, preferably ina pot of scrap babbitt, care being taken not to heatthem above 375 deg. C. Just as soon as the old liningis melted out the tinned surface should be swabbed withzinc chloride (a saturated solution of zinc in hydro-chloric acid) and dipped into a pot of half-and-halfsolde
. Electric railway journal . e until all smoke ceases, showingthat all oil and dirt have been burned off. The surfacecan then be scraped with a file and rubbed down withcoarse sandpaper in order to remove all scale and , pipe or steel shells which are tinned shouldhave the old lining removed by heating, preferably ina pot of scrap babbitt, care being taken not to heatthem above 375 deg. C. Just as soon as the old liningis melted out the tinned surface should be swabbed withzinc chloride (a saturated solution of zinc in hydro-chloric acid) and dipped into a pot of half-and-halfsolder, which should be kept at a temperature of notless than 340 deg. C. and not more than 375 deg. shells are to be babbitted immediately the tinned sur-face should not be touched after removal from thesolder pot. If the shells are to be allowed to cool thetinned surfaces can be brushed off with a piece ofclean waste. In tinning bronze or steel shells the part not to betinned should be painted with a thin mixture of graph-.
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkmcgrawhillp
