different between azotometry vs azotometer

English

azotometry (uncountable)

azoto +? -o- +? -meter

azotometer (plural azotometers)

(chemistry, obsolete) An apparatus for measuring or determining the proportion of nitrogen.
- 1885, American Journal of Science, 3rd Series, Vol. XXX, p.57 - An azotometer containing a concentrated solution of potassium hydroxide where the nitrogen was measured

azotometer in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.
William Dwight Whitney and Benjamin E[li] Smith, editors (1914) , “azotometer”, in The Century Dictionary: An Encyclopedic Lexicon of the English Language, volume I (A–C), revised edition, New York, N.Y.: The Century Co., OCLC 1078064371.

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