Permutitn.
/pəˈmjuːtɪt/, U.S. /pərˈmjudɪt/ A proprietary name for: ion-exchange material used for softening water; equipment and processes that employ such material.
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the world > matter > chemistry > equipment or apparatus > [noun] > miscellaneous apparatus
bain1477
speculum1650
filtering paper1651
wheel-fire1662
filter paper1670
sun furnace1763
respirator1789
candle-ball1794
rectifier1822
candle-bomb1823
filter1823
oxyhydrogen blowpipe1823
shade1837
graduator1839
pipette1839
thistle funnel1849
pressure tube1852
ozonizer1858
dialyser1861
Liebig condenser1861
Sprengel pump1866
Sprengel tube1866
water softener1867
mercury pump1869
Bunsen burner1870
dialysator1877
test-mixer1877
tube-condenser1877
Kipp1879
reflux condenser1880
policeman1888
converter1889
pressure boiler1891
spot plate1896
hydrogen electrode1898
sampler1902
reactor1903
fume-chamber1905
Permutit1910
microburner1911
salt bridge1915
precipitator1919
Raschig ring1920
microneedle1921
titrator1928
laboratory coatc1936
spray tower1937
precipitron1938
ion exchanger1941
potentiostat1942
chemostat1950
Knudsen pipette1951
pH-stat1956
cryopump1958
1910 Trade Marks Jrnl. 12 Jan. 44 Permutit... Chemical substances..being artificially prepared compounds for the purification of water, molasses and saccharine juices.
1937 Life 12 Apr. 18/4 (advt.) Permutit equipment is connected into your supply pipe.
1948 L. E. H. Whitby Nurses' Handbk. Hygiene (ed. 8) ii. 50 In modern houses hard water is often rendered soft by means of a ‘Permutit’ filter.
1974 D. M. Adams Inorg. Solids vii. 255 This process [sc. cation exchange] forms the basis of the Permutit water-softening process in which Ca2+ is removed from ‘hard’ water by exchange for sodium.
This entry has been updated (OED Third Edition, December 2005; most recently modified version published online March 2022).
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n.1910