1851 Great Exhibition: Official Catalogue: Class IX.: James Blackhall
From Graces Guide
33. BLACKHALL, JAMES, 22 Upper Gray Street, Edinburgh — Inventor.
Model of high-pressure boiler, for steaming bones for manure; with additional tanks for retting flax; also, for steaming straw, turnips, and other food for cattle.
Specimen of steamed bone-manure, prepared at Blackfaulds, Linlithgowshire; containing, for its preservation, 5 per cent of salt and 5 per cent of gypsum.
The process of steaming bones, and afterwards dissolving them in sulphuric acid, is intended to supersede the usual method of crushing them by expensive machinery.
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