Manhattan is an island on a slab of bedrock: Tesla took advantage of that fact and the location of his old lab down on Houston St. to cause some heartburn for the folks within a 1/4 wave or so. The machine is very clever indeed but without the island it's not much of an earthquake machine. BTW, the actual device was quite a bit bigger and attached to a concrete pillar in the basement set into the bedrock.
Occasionally I would notice stuff mechanically ringing on the subway platform from big motors and whatnot in the buildings above. I remember once trying to point this out, it was a big barred grate I was leaning against that was shaking like James Brown. This girl thought I was a schizophrenic and ran off when I told her to put their hand on the grate to feel the vibration.
Old_Zircon " This girl thought I was a schizophrenic and ran off when I told her to put their hand on the grate to feel the vibration."
YOU GOTTTA DROP SOME NEGS FIRST BRO
Oscar Wildcat It never ceases to amaze me how, on some occasions, I can say the most outlandish shit and it will be swallowed whole without question, then at other times I can make factual observations with direct evidence at hand which is rejected outright and my sanity questioned.