1823, Chemistry, entry in Charles Maclaren (chief editor), Encyclopædia Britannica, 6th Edition, page 366,
Hence it is obvious that deutoxide of azote is a compound of one volume of azote and one volume of oxygen gas united together, without any alteration of volume, consequently its specific gravity is the mean of that of oxygen and azotic gases.It is composed, by weight, of azote 0.9722 or 1.75, oxygen 1.1111 or 2. If we reckon the atomic weight of azote 1.75, this gas is obviously a compound of one atom azote and two atoms oxygen.
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