Saltpetre Purification Boile
Sheila Terry/science Photo Library
Washing Saltpetre Crystals
Sheila Terry/science Photo Library
Boiler For Refining Saltpetr
Sheila Terry/science Photo Library
Siege With Trebuchet And Greek Fire
Sheila Terry
Saltpetre Beds
Christopher Swann/science Photo Library
Saltpetre Beds #1
Christopher Swann/science Photo Library
Saltpetre Beds #2
Christopher Swann/science Photo Library
Saltpetre Beds #3
Christopher Swann/science Photo Library
Purifying Saltpetre
Eth Zurich/science Photo Library
Crystallisation Of Saltpetre
George Bernard/science Photo Library
Nitrate Anion Chemical Structure #1
Molekuul/science Photo Library
Berthollet
Sheila Terry/science Photo Library
Fall Of Constantinople
Sheila Terry/science Photo Library
Proportions Of Gunpowder Chemicals
Martyn F. Chillmaid/science Photo Library
Medieval \greek Fire\" Warship"
Sheila Terry
Sodium Nitrate Chemical Structure
Molekuul/science Photo Library
Nitrate Anion Chemical Structure
Molekuul/science Photo Library
Extracting Saltpeter
George Bernard/science Photo Library
Woodland Charcoal Burner
Sheila Terry/science Photo Library
Sodium Nitrate Chemical Structure #2
Molekuul/science Photo Library
Sodium Nitrate Chemical Structure #1
Molekuul/science Photo Library
Sodium Nitrate Chemical Structure #3
Molekuul/science Photo Library
Potassium Nitrate With Hazard Pictograms
Martyn F. Chillmaid/science Photo Library
Waterwheel Of A Pilon Powder Mill
Sheila Terry/science Photo Library
Waterwheel Of A Pilon Powder Mill #1
Sheila Terry/science Photo Library
Guncotton Manufacture
Sheila Terry/science Photo Library
Nitrate Anion Chemical Structure #2
Molekuul/science Photo Library
Nitrate Anion Chemical Structure #3
Molekuul/science Photo Library
Fall Of Constantinople #1
Sheila Terry/science Photo Library
Potassium Nitrate In A Watch Glass
Martyn F. Chillmaid/science Photo Library
Container Of The Food Additive E251
Wladimir Bulgar/science Photo Library
Container Of The Food Additive E252
Wladimir Bulgar/science Photo Library
Berthollet's Gunpowder Experiment
Sheila Terry/science Photo Library
Manufacture Of Saltpetre For Use In Gunpowder