191. The perimetric dimension system: a general system of measurement for urethral, uterine, rectal and other instruments, and an adaptable metric gauge Author(s): Thomas, Charles Hermon, author Publication: [Philadelphia?] : [publisher not identified], [1879?] Subject(s): Equipment and SuppliesWeights and Measures -- standards
192. The use of the membrana tympani as a phonautograph and logograph Author(s): Blake, Clarence J. (Clarence John), 1843-1919, author Publication: New York : William Wood & Company, 1879 Subject(s): SoundCopying ProcessesEquipment and SuppliesTympanic Membrane