(57) Abstract Objective At the time of teaching of the science junior high school and the high school the sound waveThe experimental teaching aid which can verify character and state visual sense is offered. Constitution The sound generator 1 which has the vibrating aspect 11 where directivity is superior and,You opened in the fan shape which centers the high pass virtual point source 12 of the vibrating aspectSide board focusing on 2 and high pass virtual point source top and bottom symmetrically top and bottom intervalWith the plate 3 which is made narrow gradually and side board 2 and plate 3 enclosureRare it is to consist the powder granule 4 of the light weight which spreads to the space, sideBoard opening and closing board and suritsu where opens and closes the open end of 2 and plate 3It has to board and the reflector, generates sound from diaphragm 11With, the air of the space which is surrounded in the sound wave and the side board plate resonatesWith, the powder granule lining up into concentric circular arc condition, to stand up vibrate, the stateYou can verify visual sense. In addition it resonates with the use of the opening and closing boardTo be able inform concerning condition, by use of the slit board the tsuBe able to verify the interference of the te sound wave visual sense, with use of the reflector the sound waveReflected state can be verified visual sense.
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