Stråling og ledningsevne: en Mouchot-kedel bruger varmerefleksion, et forstørrelsesglas bruger sin brydning. Anonym illustration fra 1925. Privat samling.(Radiation and conductibility: a Mouchot boiler uses heat reflexion, a magnifying glass uses its refraction. Anonymous illustration from 1925. Private collection.)Anonymous Anonymous |
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Udateret · Engraving
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