As A Scientific Instrument
Wren and Hooke built the monument to double-up as a scientific instrument. It has a central shaft meant for use as a zenith telescope and for use in gravity and pendulum experiments that connects to an underground laboratory for observers to work (accessible from the present-day ticket booth). Vibrations from heavy traffic on Fish Hill rendered the experimental conditions unsuitable.
A hinged lid in the urn covers the opening to the shaft. The steps in the shaft of the tower are all six inches high, allowing them to be used for barometric pressure studies.
Read more about this topic: Monument To The Great Fire Of London
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