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Updated: May 4, 2025
I ascended the various floors, and had all the processes minutely and clearly described to me in a most courteous manner, by the superintendent of the battery. I afterwards went down into the mine, first to the 70-feet, and then again to the 150-feet levels.
Unfortunately, only a few giant stars are certain to fall within the range of our present instrument. An interferometer of 70-feet aperture would be needed to measure Sirius accurately, and one of twice this size to deal with less brilliant white stars.
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