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Monument, Kensal Green Cemetery
Monument, Kensal Green Cemetery
Monument detail, Kensal Green Cemetery
Monument detail, Kensal Green Cemetery
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Hermann von Helmholtz
Hermann von Helmholtz
Helmholtz's polyphonic siren, Hunterian Museum, Glasgow
Helmholtz's polyphonic siren, Hunterian Museum, Glasgow
Helmholtz in 1848
Helmholtz in 1848
1889 copy of Helmholtz's "Uber die Erhaltung der Kraft", no. 1
1889 copy of Helmholtz's "Uber die Erhaltung der Kraft", no. 1