8.00" x 10.00"
10.00" x 12.00"
Physiological Measurement Of A Person's Breathing Poster
by Science Photo Library
Physiological Measurement Of A Person's Breathing by Science Photo Library - 8" x 10"
Luster Photo Paper
Rolled in a Tube
Physiological Measurement Of A Person's Breathing poster by Science Photo Library. Our posters are produced on acid-free papers using archival inks to guarantee that they last a lifetime without fading or loss of color. All posters include a 1" white border around the image to allow for future framing and matting, if desired.
Breathing measurement. Physiological measurement of spiritualists' breathing during a seance. The spiritualists must maintain an air pressure to... more
3 - 4 business days
Breathing measurement. Physiological measurement of spiritualists' breathing during a seance. The spiritualists must maintain an air pressure to maintain the position of the floats in the U- shaped tube at centre. This measurement formed part of an experiment designed to discover whether voices produced during seances were caused by supernatural means or by ventriloquism by the spiritualists. Even when using this equipment, some spiritualists were still able to produce spirit voices". Photographed at the Society for Psychical Research in London, Great Britain, during the 1920s."
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