It is not so many years ago that a distinguished member of the French Academy of Science rose up amongst his colleagues and pronounced the Edison phonograph to be nothing more than an acoustical illusion.
"War and the Weird"
Forbes Phillips R. Thurston Hopkins
The room, apparently, was designed on the acoustical principle of an echo chamber or a drum.
"Tangle Hold"
F. L. Wallace
There would be no difficulty in measuring the reaction times of the horses in thousandths of a second for optical and acoustical and tactual impressions, or in studying the influence of artificial colour effects on the various insects in the service of agriculture.
"Psychology and Social Sanity"
Hugo Münsterberg