Auroræ: Their Characters and Spectra — Instructions in the use of the Spectroscopes supplied to the Arctic Expedition. By J. Norman Lockyer, F.R.S. Spectroscop

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Auroræ: Their Characters and Spectra Instructions in the use of the Spectroscopes supplied to the Arctic Expedition. By J. Norman Lockyer, F.R.S. Spectroscop · ch 109/119

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