Doppler Effect Arm.

P.I.R.A #: 3B40.10

Illustrates: Sound frequency changes.

Description: A Sonalert siren swings around to show effect.

Size: 15" h x 47" w

Notes: Start arm slowly then increase speed.

Hazard: Arm can hit you.

Condition: Good.

PIRA #	ITEM
3B40.10	Doppler Effect Arm

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