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Mercurous Sulfate: Mercury Dissolved in Sulphuric Acid with Gentle Heat (Thorpe, 1912)
Mercurous sulphate, the white salt of the Clark and Weston standard cells: 2 parts of mercury dissolved in 3 parts of sulphuric acid with the help of gentle heat.
Water turns the salt first into a basic sulphate and finally into the oxide, so it is kept from water.
Unknown: how the salt is taken out of the acid. Thorpe does not give it. Not given: the acid strength.
Source: T. E. Thorpe, Dictionary of Applied Chemistry vol. III (1912), p. 452. Picture: the book's text.
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