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132 pages, Kindle Edition
First published January 1, 1920
"The secret which our modern science has groped for, but not yet found - a device for recording and reproducing thought vibrations."
Porter's brows were knit in a frown of perhaps excusable bewilderment, and as Blair's blank eyes met the doctor's the latter realised that his ingenious theorising had been intelligently followed by no one save himself. Still, that he had evolved an explanation on material grounds to satisfy even himself meant a great deal to Dr Vanaman just then.