Word: bone
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Dates: during 1930-1939
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Announced for early marketing by both Dictograph Products Co., Inc., and Sonotone Corp. were similar portable devices for hearing by bone-conduction of sound Dictograph's instrument was new, Sonotone's an improvement on one it began marketing last November. That was developed by Sonotone's Dr. Hugo Lieber, after Sonotone gave up the U. S. distributing rights to "Fortiphone", hearing aid produced by Berlin's Siemens & Halske...
Sound waves are more easily conveyed through some solids, among them human bone, than through air. The devices announced last week simply short-circuit the outer and middle ear, transmit sound vibrations directly to the auditory nerves via head bones. Sound waves are picked up by a transmitter, passed through a pocket amplifier to a tiny oscillator, which a head band holds snugly against the mastoid bone behind the ear. (Sonotone's improvement consisted in eliminating an oscillator "button" which protruded uncomfortably against the head...
...often commonly caused by some obstruction in the outer ear passage or by hardening of the middle ear ossicles. Present, familiar air-conduction hearing devices are simply modified telephone receivers which step up sound vibrations to penetrate through the obstructed passage to the inner ear. Advantages claimed for the bone-conduction instrument are a mellower, more natural tone, an increase in hearing range. No more than the air-conduction instrument will it restore hearing to people whose auditory nerves are impaired...
...announced last week, meant cuts of 8% to 20% in all salaries over $1,500. It also meant the dismissal of 66 teachers, including four full professors, and 39 nonacademic em ployes. On part-time went 122 others. Administrative and maintenance expenditures will be cut to the bone...
...kill the elk and rangers cull out the bison. There will be Indians as well as geysers, about which government guides lecture at intervals all day long, at Old Faithful Inn. It is best not to do much public drinking in the Government hostels. The Federal preserves were bone Dry long before national Prohibition...