In any case not enough oil remained on the hairsprings to cause the coils to adhere. [Please select]
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The hairsprings were dipped into the solution, and, on withdrawing, were immediately placed between two folds of soft linen cloth. [Please select]
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One per cent of nitric acid was added to the water, and after ten days the hairsprings showed on examination that they had rusted in proportion to the amount of oil that had been used. [Please select]
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