What is the poetic meter in P B Shelley's poem The Cloud?

This poem does not have a regular rhyming scheme or a particular regular metre. It is more of a free verse poem. The structure he used was one that did not require even for the stanzas to be of the same length or have a repeating rhythm and the rhymes, where they occur tend to be (although not exclusively and sometimes assonantly) the final three couplets in each stanza, along with some idiOSynchratic internal rhymes.