Sound Powered Telephones
Sound powered telephone equipment consists of headsets and handsets,
call-signal stations, and amplifiers.
Pacific Ocean (May 1, 2003) -- President George W. Bush passes through the "side boys" after a successful trap aboard the USS Abraham Lincoln (CVN 72) in a S-3B Viking assigned to the Blue Wolves of Sea Control Squadron Three Five (VS-35) designated "Navy 1". President Bush is the first sitting President to trap aboard an aircraft carrier at sea... U.S. Navy photo by Photographer's Mate 3rd class Tyler J. Clements. (RELEASED) **
A Dynalec sound powered headset-set/chest-set is worn by the sailor on the left.