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Automatic water-hardness recorder
Instrument invented by H. S. HATFIELD and manufactured by White Electrical Instrument Co, London; operates by taking in samples of water alternately from two sources, generally source of soft and source of hard water, and by performing soap test upon them. (French abstract) (See also Engineer v 157 n 4079 Mar 16 1934 p 278)
Automatic water-hardness recorder
Instrument invented by H. S. HATFIELD and manufactured by White Electrical Instrument Co, London; operates by taking in samples of water alternately from two sources, generally source of soft and source of hard water, and by performing soap test upon them. (French abstract) (See also Engineer v 157 n 4079 Mar 16 1934 p 278)
Automatic water-hardness recorder
Genie Civil
Genie Civil ; 105
1934
Article (Journal)
French
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