Dot-dash-diss: The gentleman hacker's 1903 lulz
"Someone, Blok reasoned, was beaming powerful wireless pulses into the theatre and they were strong enough to interfere with the projector's electric arc discharge lamp."Serious power! Remember this was before tuned circuits became common (google 'syntony oliver lodge'). Even allowing for the sensitivity of a balanced carbon spark gap, you need to move a carbon rod or have a magnetic field strong enough to change the position of the discharge. He must have been in the same building...