from The Century Dictionary.
- To filter by means of a filter-press.
- noun A filtering-press.
- noun Specifically An apparatus for the extraction of oil from fish, as menhaden, and the compression of the residuum into cakes.
Sorry, no etymologies found.
By the introduction a few years ago of the filter-press, their value has been considerably enhanced.
The sludge experimented upon was that produced by sulphate of alumina, lime, and sulphate of iron, and contained, after being subjected to Johnson's filter-press, from .6 to .9 per cent of nitrogen, and over 1 per cent of phosphoric acid.
By the use of Johnson's filter-press, however, a sludge containing 90 per cent of water was at once reduced to 50 per cent or even less.
The original residue from the filter-press, if it does not contain indigo, may be at once put to similar use.
Stir well together, allow all sediment to settle, or better, filter-press the mass.
Now the filter-press squeezes this through canvas bags until after having been pressed between iron plates you get your cakes of smoothly mixed clay of about the consistency of putty.