Reference > Brewer’s Dictionary > Equal-to,

 Epsom Salts.Equation of Time. 
CONTENTS · BIBLIOGRAPHIC RECORD
E. Cobham Brewer 1810–1897. Dictionary of Phrase and Fable. 1898.
 
Equal-to,
 
in mathematics. The symbol (=), two little parallel lines, was invented by Robert Recorde, who died 1558.   1
        “As he said, nothing is more equal than parallel lines.”
 


 Epsom Salts.Equation of Time. 

 
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