Officer Young demonstrates the use of J-38 Hand key for good hand sending of morse code via telegraph. He shows an enlarged model of the J-38 key for demonstration. He explains that the gap between the controls has to be right. The other officer opens the screws to loosen spring and align contact. The gap is set to a thickness of four folds of paper. Officer Jones tunes the hand key. Officer Young explains importance of developing technique. Woman plays piano to demonstrate technique. Man demonstrates technique through drum.
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