Helmholtz double siren, F. Sauerwald, Berlin, c. 1870 - Putnam Gallery - Harvard University - DSC08074

Helmholtz double siren, F. Sauerwald, Berlin, c. 1870 - Putnam Gallery - Harvard University - DSC08074

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self-published workcc-pd-markauthor died more than 100 years ago public domain imagescc-zerohelmholtz double sirenscientific instruments in the harvard university science center

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