Externally Collection

Production of Salpetre (Nitre, Potassium Nitrate, or KN03). Nitre beds, heaps of manure mixed with chalky earth
540747 Production of Salpetre (Nitre, Potassium Nitrate, or KN03). Nitre beds, heaps of manure mixed with chalky earth. These were watered with urine and manure water

Crystallization of Saltpetre (Nitre, Potassium Nitrate, or KN03, 1574 (engraving)
540753 Crystallization of Saltpetre (Nitre, Potassium Nitrate, or KN03, 1574 (engraving); (add.info.: Crystallization of Saltpetre (Nitre, Potassium Nitrate, or KN03)

Checking the quality of Saltpetre (Nitre, Potassium Nitrate, or KN03). Saltpetre is the principal ingredient in
540750 Checking the quality of Saltpetre (Nitre, Potassium Nitrate, or KN03). Saltpetre is the principal ingredient in gunpowder, and is still used in the preservation of some foods

South east view of the Princes Chamber (engraving)
603218 South east view of the Princes Chamber (engraving) by Smith, John Thomas (1766-1833); Private Collection; (add.info)

Horace Field, Architect (b / w photo)
3652336 Horace Field, Architect (b/w photo) by English Photographer, (20th century); Private Collection; (add.info.: Horace Field, Architect)

Ryan FR-1 Fireball -externally similar to its contemporaries, this fighter had a jet engine (aft) to boost its speed

Crystallization of Saltpetre (Nitre, Potassium Nitrate, or KN03. Saltpetre is the principal ingredient in gunpowder, and is still used in the preservation of some foods)

Production of Salpetre (Nitre, Potassium Nitrate, or KN03). Nitre beds, heaps of manure mixed with chalky earth. These were watered with urine and manure water

Checking the quality of Saltpetre (Nitre, Potassium Nitrate, or KN03). Saltpetre is the principal ingredient in gunpowder, and is still used in the preservation of some foods

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