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Ice jigger
The ice jigger also known as prairie ice jigger, or prairie jigger, is a device for setting a fishing net under the ice between two ice holes, invented by fishermen of Canada in early 1900s.〔
The jigger consists of a slotted wooded board that floats under the ice surface and two levers connected in such a way that when a rope connected to one lever (arm) is pulled, the second lever (leg) jabs into the ice and pushes against the ice to move the board in the direction opposite to the rope pull. After each pull a spring resets the arm, and the action is repeated. In this way a person by an ice hole propels the jigger away. If the ice is transparent enough, one just makes another hole over the jigger when it moves far away. (Otherwise the progress of the jigger may be monitored by the tapping noise of the jigger's leg.)〔 After that the jigger is pulled out of the second hole, together with the rope, and the net may be stretched under the ice using the rope from one hole to another.〔(Arctic Fishing - Ray Mears World of Survival ), BBC〕〔W. M. Sprules, ("The “prairie ice jigger”" ), Polar Record / Volume 8 / Issue 56 / May 1957, pp 441-444, 〕〔(【引用サイトリンク】title=Fishing net jigger used to pull nets under the ice | Collections Search Center, Smithsonian Institution )〕〔Popular Science Feb 1963, (p. 147 )〕〔(【引用サイトリンク】title=WebWaves | Fisheries and Oceans Canada )〕〔(【引用サイトリンク】title=Ice fishing - YouTube )〕
The simple and effective design remained basically unchanged since its invention.〔(【引用サイトリンク】title=Manitoba Fisheries Sustainable Development - Grade 5 )〕 Imler (1971)〔Richard Imler, (Radio Telemetry as an Aid in Winter Gill Netting ), The Progressive Fish-Culturist Volume 33, Issue 1, 1971, 〕 described the use a radio transmitter to locate the jigger under heavy ice cover by Colorado fishery biologists.〔(【引用サイトリンク】title=GUIDELINES FOR SAMPLING FISH IN INLAND WATERS )〕
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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