Logotipo do Museu de Metrologia
Versão em inglês. Para mudar para português clique Globe and PT
The keys of the safe box
Caixa com chave da arca dos padrões
A key of the safe box

The safe box were the standards were kept had three locks that were opened using three different keys. These three different keys were kept by three different custodians.

Next to the safe box we can see threee small boxes used to keep the three keys, each one with the corresponding key.

According to Joaquim José da Graça, the custodians were the Ministry of Public Works, the Director-General of Public Works and the Superintendent of Weights and Measures.

Further information​

António Neves: aneves@ipq.pt
Museum of Metrology: museu.metrologia@ipq.pt