| 摘要 |
PURPOSE:To instruct a fisher fishes that can be fished every month, at every water temperature and by respective baits in a moment by combining a large disk on which water temperature in every month is indicated with a small disk on which kinds of baits and fishes are indicated. CONSTITUTION:A frame sectioned into twelve equal parts is provided on the surface of a large disk. Names of months from January to December and average water temperature of the surface of sea water are indicated in each frame in parts where not overlapped by a small disk when the centers of two large and small disks are superposed, and water temperature of the month and names of fishes that can be fished in that month are indicated in the same frame in the part of the large disk covered by the superposed small disk. The centers of the two large and small disks are superposed and a part of the small disk is cut out to make a space so that one section out of twelve sections on the large disk is visible when the centers of the two large and small disks are superposed. Kinds of baits and names of fishes that can be fished are written on the surface of remaining plate of the small disk.
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