Bom artigo do Instituto Português de Relojoaria
https://www.institutoportuguesderelojoaria.pt/post/solar-jo%C3%A3o-da-silva-d%C3%ADptico-madeira-1890?utm_source=so&cid=7fe1b91e-9574-4009-beba-820452bc3425&utm_content=f857d268-55a0-429f-81e1-35f5cb9eb576&postId=2f32d139-8a8e-4288-85bf-f0197b519a1e&utm_campaign=c3900468-b3c1-48ef-a60d-5005c996c1db&utm_medium=mail
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