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![Ultrasonic Whistle, adjustable pitch [Vintage]](http://curiousminds.co.uk/image/cache/data/Vintage/Physics/Ultrasonic wistle-125x125.jpg "Ultrasonic Whistle, adjustable pitch [Vintage]")
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£19.20
Ex Tax: £16.00
Ex Tax: £16.00
![Griffin Melde's Apparatus [vintage]](http://curiousminds.co.uk/image/cache/data/Vintage/Physics/Meldes/meldes2/1-125x125.JPG "Griffin Melde's Apparatus [vintage]")
When an alternating electrical current is passed through a Melde's apparatus it causes an attached s..
£19.20
Ex Tax: £16.00
Ex Tax: £16.00
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