What is the meter of poem London by William Blake?

"London" by William Blake is written in anapestic tetrameter, which means each line has four metrical feet, and each foot contains two unstressed syllables followed by a stressed syllable.

Here's an example from the poem:

"I wander through each char- act-ed street,"

Here, the four feet are: "I wander," "through each," "char-act-ed," and "street." Each foot has the unstressed-unstressed-stressed pattern.

While the poem generally follows anapestic tetrameter, there are some variations and deviations for emphasis and rhythm. This makes the poem a bit more lively and dynamic than if it were strictly adhering to a regular meter.