Reference numberNLB/51/402
Alternative reference numberNLB/51 p257
TitleCopy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society to the Secretary, the War Office
Date12 March 1915
Description'With respect to yhe question submitted by you to the Royal Society I now beg to report as follows:
"Nitre Cake remaining as residue in the manufacture of nitric acid has hitherto been worked up into "salt cake" by fusing it with common salt. The excess of sulphuric acid in the nitre cake is thus utilized for the production of a further quantity of sodium sulphate and hydrolic acid. Salt cake is used in the manufacture of glass but the demand for it has fallen off very seriously, glassmakers in France, Belgium and Germany noo longer being able to import it.
The excess of sulphuric acid in the nitre cake might be utilized by manufacturers of superphosphate fertilizers. It would be quite worth while to offer it to these manufacturers though they would probably not care to pay more than a fraction of its free acid value".'
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    Browse the records of some of our collections, which cover all branches of science and date from the 12th century onwards. These include the published works of Fellows of the Royal Society, personal papers of eminent scientists, letters and manuscripts sent to the Society or presented at meetings, and administrative records documenting the Society's activities since our foundation in 1660.

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