May 28, 1938
The half-million volt Westinghouse surge generator in operation at The Franklin Institute.
The artificial lightning bolt, striking with the power of a 50 calibre bullet, shatters a four-inch billet of wood so quickly the camera's eye pictured only the top of the block.
The rest was instantaneously splintered and knocked out of camera range.
Print No. Wes. 108
Original Caption by Science Service