gertrude was the sonar device that let morse code messages be sent underwater from a submarine in 1915.
gertrude was the sonar device that let morse code messages be sent underwater from a submarine in 1915.
what sonar device let morse code messages be sent underwater from a submarine in 1915?
gertrude
section::::radio work.:audio transmissions.









































fessenden had a very early interest in the possibility of making audio radio transmissions, in contrast to the early spark-gap transmissions that could only transmit morse code messages. as early as 1891, he had investigated sending alternating currents of varying frequencies along telegraph lines, in order to create a multiplex telegraph system. he would later apply the knowledge gained about tuning and resonance from his alternating current electrical work to the higher frequency currents used in radio, in order to develop the concept of continuous-wave radio signals.
reginald fessenden
bullet::::- kirk langstrom/man-bat appears in "the batman", voiced by peter macnicol while special sound effects provide man-bat's vocal effects. this version is an employee at wayne enterprises doing research on bats and apparently afflicted with albinism. when bruce wayne begins to cut off the funding for his project, langstrom tells bruce that he needs the project to cure his niece's deafness. when bruce discovers that langstrom is lying, he goes to langstrom's office to discover both langstrom's obsession with batman and the project's real purpose. langstrom arrived in his vault to find his boss there; he admits that he created the formula so he could be feared like batman, and drinks a serum, resulting in his man-bat transformation. he attacks bruce at his office, and escapes. batman confronts man-bat in gotham city's skies, landing on the ground, and langstrom reverts to his human form. to be safe, batman destroys one of langstrom's vials. langstrom drinks the remaining vial, transforms into man-bat, and kidnaps detective ethan bennett. batman confronts man-bat in a sewer, and langstrom reverts to his human form, and is taken away to arkham asylum. while in arkham asylum, langstrom is trying to recreate the man-bat serum, while the penguin finds a sonar device to control a large condor, but ends up with a sonar device designed to control bats. when the penguin uses the device, dormant remnants of the man-bat formula still inside langstrom reawaken, resulting in his man-bat transformation and instinctively leading him to the penguin's hideout. with the sonar device, the man-bat does the penguin's bidding, returning him to his human form by saying "rest". langstrom is furious with the penguin when he learns the penguin's plans, promising that the penguin will feel man-bat's wrath. at the docks, batman confronts man-bat and, using his own sonar device, induces a reversion back to his human form. langstrom and penguin are both taken back to arkham. langstrom later returns in as one of the many villains captured by the vigilante rumor. he was shown in his human form and later in his man-bat form, implying he has full control over his transformation. langstrom made one last appearance, no longer a villain and renouncing the man-bat name. batman charged langstrom with creating an antidote for his own mutagen that some college students had stolen from him and were planning on infecting the entire student body with.
man-bat