PROBLEM TO BE SOLVED: To prevent noises, caused when an electrostethoscope, for hearing body sounds by bringing its sound collecting part into contact with the surface of the body, makes contact with the surface of the body, from coming out of loudspeakers or headphones as loud sounds by ...
an amplifier for amplifying an electric circuit of the microphone and a galvanometer affected by the final output from the amplifier, means being provided for graphically recording the deflections of the galvanometer so that thereafter the vibrations or other sound recorded can be accurately analyzed ...
phonophan is the Web site of noted recorded sound historian and much-published author Tim Fabrizio,dedicated to preserving, understanding and purveying antique phonographs, talking machines, gramophones, Victrolas, graphophones,and related items such as Edison, Victor, Columbia, Zonophone, Berliner, ...
Seamen dropped a number of devices that would give out a loud noise when they hit the bottom. And a device had been invented measured the time it took for the sound to reach the ship .It helped oceanographer map the ocean floor.
PROBLEM TO BE SOLVED: To prevent noises, caused when an electrostethoscope, for hearing body sounds by bringing its sound collecting part into contact with the surface of the body, makes contact with the surface of the body, from coming out of loudspeakers or headphones as loud sounds by ...