The lightning follows the path down to a conventional lightning arrester, a device that safely leaks the charge directly to earth, preventing lightning running to earth through a nuclear reactor.
From the newscientist.com
Notable inventions created by Thomson during this period include an arc-lighting system, an automatically regulated three-coil dynamo, a magnetic lightning arrester, and a local power transformer.
From the en.wikipedia.org
In telegraphy and telephony, a lightning arrester is placed where wires enter a structure, preventing damage to electronic instruments within and ensuring the safety of individuals near them.
From the en.wikipedia.org
With the building being about 50% timber a lightning strike would probably set it alight if the arrester was stolen.
From the independent.co.uk
The business is behind surge arrester products, which provide protection against damage from lightning and other over-voltages.