sal soda en · NOUN
Meanings
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(uncountable) sodium carbonate
Water 1 gallon, clean tallow, 3 lbs., palm oil 6 lbs., common sal soda ½ lb., (or tallow 8 lbs., and palm oil 10 lbs.,)—mixture to be heated to 210° and well stirred till it is down to about 70°.
1847, editorial staff, “Patent Grease for Railway Axles”, in Scientific American, series 1, Volume 3, Issue 9, page 72: