Handbook of High Speed Photography - IET Labs, Inc.

Study of effect of strong transverse electric fields on
falling liquid drops, as might occur in rain clouds.
Multiple-flash photographs were taken at a Strobotac
flashing rate of 700 flashes per minule while a drop
of milk fell between two metal plates charged lo create
a field strength of 10 kv/cm. The drop stretches out as
it falls until a discharging spark occurs, after which
surface tension pulls it together again. Royal X
4 x 5 sheet film developed in D76. Courtesy of
David C. Eldridge, Edward M. Skinner, and James
fsepas, Andover High School, Massachusetts.
Shadowgraphs of a bullet passing through a soap
bubble filled with Freon-12. A Strobotac was used as a
point source by removal of Ihe refleclor and orienlalion
of the flash lamp so lhal the arc of Ihe flash was
in line with the direction of Ihe subject and about
three yards distant. Instead of a camera, a Poloroid
4 x 5 film back with Polaroid 3000 film was placed
3}/i from Ihe bubble on the opposite side from the
light source. The flash was triggered by means of a
microphone. Photograph below shows bullet entering
bubble and the intensification of Ihe shock wave in the
Freon-12. Photograph at bottom shows another bullet
leaving a bubble, with strong turbulence in ils wake.
Courtesy of David C. Eldridge, Edward M. Skinner, and
James Tsepas, Andover High School, Massachusetts.
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