Construction and working of soda acid fire extinguisher
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A soda-acid extinguisher was patented in the U.S. in 1881 by Almon M. Granger. His extinguisher used the reaction between sodium bicarbonate solution and sulfuric acid to expel pressurized water onto a fire. ... One used a plunger to break the acid vial, while the second released a lead stopple that held the vial closed.
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