Johnson and Sons Assayers
of Finsbury, London
1743 Company established. There are three companies owned by the same family:
- Johnson and Sons Assayers, Ltd.
- Johnson and Sons Manufacturing Chemists, Ltd.
- Johnson and Sons Smelting Works, Ltd.
1889 Exhibited gold chloride, as separate individual crystals, perfectly dry-silver nitrate, and potassium cyanide.
1914 Assayers to H M Mint, the Bank of England and the Council of India. Specialities: Assaying, melting and refining gold and silver bullion; testing of metallurgical processes and ores; manufacturing of chemicals for assay and mining purposes, for photography, process work and electro-plating; packing of photographic chemical specialities and pure chemicals for general purposes. Employees 220.