THE MAGNETIC NEEDLE. Old Papyri at the Chicago University. The Acetylene Gas Hazard. state when it requires a pressure of 600 pounds per VARIATIONS OF THE NEEDLE. prevention of dangerous explosive admixtures of air primarily to improve the flavor of food., scientific american, 1898-10-08


THE MAGNETIC NEEDLE. Old Papyri at the Chicago University. The Acetylene Gas Hazard. state when it requires a pressure of 600 pounds per VARIATIONS OF THE NEEDLE. prevention of dangerous explosive admixtures of air primarily to improve the flavor of food., scientific american, 1898-10-08


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