Still- "Lenny," he said carefully, "are you sure you didn't jigger up those drawings to make 'em look prettier?"
"The Foreign Hand Tie"
Gordon Randall Garrett
In 1898, Mr. Marconi made a great advance in the construction of his receiving apparatus by the insertion of his "jigger" or oscillation transformer in the aerial receiving circuit.
"Hertzian Wave Wireless Telegraphy"
John Ambrose Fleming
It is this exalted electromotive force which is made to act on the coherer tube, and, inasmuch as the jigger operates in virtue of a current passing through its primary circuit and this current is at a maximum at the lower end of the aerial, the arrangement is exceedingly effective, because it, so to speak, converts current into voltage.
"Hertzian Wave Wireless Telegraphy"
John Ambrose Fleming