General Purpose Filter

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Any substance, as cloth, paper, porous porcelain, or a layer of charcoal or sand, through which liquid or gas is passed to remove suspended impurities or to recover solids.


Government Printing Office Official Gazette (Washingon, DC: Government Printing Office, 1912)


TIFF (full resolution)

2400×1367, 719.1 KiB

Large GIF

1024×583, 131.9 KiB

Medium GIF

640×364, 68.6 KiB

Small GIF

320×182, 24.4 KiB