The combination of the two gases is brought about in a tube called a eudiometer.
The eudiometer that I have lately employed gives, in a few minutes, the proportions of oxygen without correction.
The exact details for the preparation of eudiometer tubes are given by Faraday (Chemical Manipulation, § 1200).
A bubble or two of oxygen is now passed into the eudiometer; if nitric oxide is present, red fumes at once develop.
A eudiometer tube is filled with mercury and inverted in a vessel of the same liquid.
The consideration of the high qualities of art must not be interrupted by the work of the hammer and the eudiometer.