File Protection
[SN the course of set construction it is often found necessary to file soft metal. It may ,be that, aluminiym vanes are being shaped "for a ‘homemade neutralising ¢condénsér;{’ or one may be removing solder from::tags or from the tips, of. terminals. ...Nothing is more damaging to a’ good ‘fife ‘than to use it for this purpose, .for- the metal rapidly clogs it and :spoils’ its keenness.. "This can be::prévented if the file is first rubbed over with a piece of chalk, which partially fills the hollows and thus prevents: clogging. ©The file may be quickly cleaned afterwards by means of a file card or a~ stiff’ wire ‘brush.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19291213.2.77
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Radio Record, Volume III, Issue 22, 13 December 1929, Page 31
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111File Protection Radio Record, Volume III, Issue 22, 13 December 1929, Page 31
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