Seven metals, ringed with four magical inscriptions: what other secrets does the 'Alchemical Hand Bell' hold?

Habsburg emperor Rudolf II owned a spirit-summoning alchemical hand bell. We want to decipher its cryptic Greek inscriptions.
Read more: https://theconversation.com/seven-metals-ringed-with-four-magical-inscriptions-what-other-secrets-does-the-alchemical-hand-bell-hold-204367?source=Snapzu