HOLD YOUR EARS!
CD 1963035 E&MP 21.020
July 3, 1934
A high-ampere generator is about to discharge in this photograph.
Notice that the men watching the generator are stuffing their fingers
into their ears to protect them from the loud report when the current
The loud report from the electrical discharge, we see on stormy nights
as lightning, is thunder.
[a closer look]
Original Caption by Science Service