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The Mechanical Bloodhound by Frank Bridge:
Science Fiction Inventions, Technology and Ideas

"WE are accustomed to think of our noses as the only means of detecting a scent or odor; but in truth our organ of smell is only a rather poor instrument that nature has given us. We humans, especially, have not a very sensitive means to determine smell. In fact, the lower animals are greatly superior to us in this respect. Many experimenters have worked on the question of finding a substance which is automatically sensitive to odors, and by which the differences of various odors can be detected. If such a thing were to be found, it would be like a mechanical bloodhound. In other words, it could be used to easily trace criminals by their characteristic odor, a thing which they cannot disguise. How such an instrument could be used in an actual case our author shows in a very fascinating story."

('The Mechanical Bloodhound' by Frank Bridge))

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