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"An apparatus devised by Mach for the illustration of the pendular motions of the particles of a medium transmitting waves of any kind, longitudinal or transverse, stationary or progressive." — Avery, 1895

Line of pendulums

"An apparatus devised by Mach for the illustration of the pendular motions of the particles of a medium…

"Stegomyia, the carrier of yellow fever germs." — Davison, 1906

Stegomyia

"Stegomyia, the carrier of yellow fever germs." — Davison, 1906