Series of ten resonators. After Helmholtz, by Koenig, Paris See a color photograph of these devices in the <link href='http://dssmhi1.fas.harvard.edu/emuseumdev/code/emuseum.asp?rawsearch=Number%2F%2C%2Fis%2F%2C%2FWJ0011d %2F%2C%2F0%2F%2C%2F0'>Harvard Collection of Historical Scientific Instruments</link>. Series of ten resonators. After Helmholtz, by Koenig, Paris
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