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Updated: July 31, 2024
It seems strange that the advantage of the three-circle aneroid is so little known in this country, for its three concentric circles give such an open scale that, although this particular instrument reads to twenty-five thousand feet, it is easy to read as small a difference as twenty feet on it.
The mercurial barometer reading by verniers to three places of decimals was set up and read, and the two aneroids were adjusted to read with it. These two aneroids perhaps deserve a word. Aneroid A was a three-inch, three-circle instrument, the invention of Colonel Watkins, of the British army, of range-finder fame.
The boiling-point apparatus was put together and its candle lighted under the ice which filled its little cistern. The three-inch, three-circle aneroid was read at once at thirteen and two-tenths inches, its mendacious altitude scale confidently pointing at twenty-three thousand three hundred feet.
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